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CBSE Questions for Class 10 Physics Magnetic Effects Of Electric Current Quiz 9 - MCQExams.com
CBSE
Class 10 Physics
Magnetic Effects Of Electric Current
Quiz 9
Which of the following correctly shows the magnetic field produced by an electric current in a long straight wire?
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Explanation
In the magnetic field produced by an electric current in a long straight wire, the magnetic field lines are co-centric circles. So, option A and B are consistant with this but the direction of the line is also a factor here.
IT is determined by Maxwell's right hand thumb rule, which suggests, if I am holding the wire in my right hand such that the thumb points towards the direction of current, then my fingers will wrap around the wire in the direction of field lines.
So, in the case of the given problem the direction of the field line will be anti-clockwise as that of option (B).
So, option (B) is correct.
According to Fleming's left-hand rule, whose direction is indicated by thumb?
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Electric current
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Magnetic force
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Magnetic field
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None of these
Explanation
According to Fleming's left-hand rule, if we stretch the thumb, forefinger, and the middle finger of the left-hand perpendicular to each other, then the forefinger indicates the direction of the magnetic field, the middle finger denotes the direction of current and the thumb represents the direction of the force.
The diagram shows a coil of wire connected to a voltmeter. A student has a magnet and an unmagnetised iron rod. How can an e.m.f. be induced across the coil?
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Holding the magnet inside the coil
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Holding the iron rod inside the coil
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Pushing the magnet into the coil
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Pushing the iron rod into the coil
Explanation
As the magnet is pushed into the coil, more magnetic flux will pass through the coil. Therefore, it causes a change in magnetic flux linked with the coil. This changing magnetic flux will induce an emf across the coil.
Which diagram shows the magnetic field around a bar magnet?
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Explanation
Two magnetic field lines never interest each other.
Outside the magnet, the magnetic field lines are directed from North pole of the magnet towards the South pole.
The magnetic field lines at any one point give the direction of magnetic field at that point
Electromagnetic induction means ......... .
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charging of an electric conductor.
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production of magnetic field due to a current flowing through a coil.
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generation of a current in a coil due to relative motion between the coil and the magnet.
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motion of the coil around the axle in an electric motor.
Explanation
The process of producing induced current in a closed circuit or in a coil by changing the magnetic field (i.e. relative motion between the coil and magnet) linked with the coil is known as electromagnetic induction. ... This process of producing induction current is known as electromagnetic induction.
Which of the following is correct representation of magnetic lines of force ?
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None of the above
Explanation
The lines of magnetic field from a bar magnet form closed lines. By convention, the field direction is taken to be outward from the north pole and in to the south pole of the magnet. Inside a bar magnet its from south to north pole.
Hence option A is correct.
The diagram shows the magnetic field around two bar magnets. Which diagram shows the poles of the magnets?
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Explanation
It is clear that the magnetic line of force starts from N-pole and ends at S-pole.
The diagram in option (C) is correct representation of magnetic line of force.
Choose the incorrect statement.
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Alternating current is oscillatory
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Electric power is transmitted over long distances using alternating current.
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Frequency of alternating current in India is 50 Hz.
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Alternating current can be used for electrolysis of copper chloride.
Explanation
Even if it were current-limited, alternating current (AC) would not be appropriate for electrolysis. Because the "cathode" and "anode" will be constantly switching places as the polarities will change with time. Therefore, direct current (DC) is used for electrolysis.
Write true or false for the following statements :
To find the direction of magnetic field around a current carrying conductor , we use Fleming's left hand rule .
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True
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False
Explanation
To find the direction of the magnetic field around a current-carrying conductor we use the Right-hand thumb rule, and we use Flemings left-hand rule to find the direction of the force on a current-carrying conductor in a magnetic field.
A current wire produces :
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an electric field
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a magnetic field
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both electric and magnetic fields
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neither electric nor magnetic field
Explanation
Whenever current is passed through a conductor it develops magnetic field around it , in case wire the magnetic field is circular around it and is given by right hand thumb rule .
An electric motor converts mechanical energy into electrical energy.
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True
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False
Explanation
The electric motor is a device used to convert electrical energy into mechanical energy. The generator is a device used to convert mechanical energy to electrical energy.
Write true or false for the following statements :
Inside an infinite solenoid , the magnetic field is constant in magnitude and direction.
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True
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False
Explanation
Inside the solenoid, the magnetic field lines are equally spaced and parallel and are inside circular curves of solenoid which provide uniformity.
The phenomenon of electromagnetic induction is :
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the process of charging a body
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the process of generating a magnetic field dur to current passing through a coil.
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producing induced current in a coil by relative motion between a magnet and a coil.
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the process of rotating a coil of an electric motor.
Explanation
When there is relative motion between a magnet and a closed loop there is formation of induced emf due to change in magnetic flux linked with the coil. More the speed more the induced emf.
Write true or false for the following statements :
An electric generator is a device that converts electrical energy into mechanical energy.
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True
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False
Explanation
An electric generator is a device used to convert mechanical energy, which is used to rotate the coil between magnets, into electrical energy which is obtained by the phenomena called electromagnetic induction.
Write true or false for the following statements :
The electric current that always flows in the same direction is called alternating current.
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True
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False
Explanation
The electric current which always flows in the same direction is called $$direct $$ $$current$$, and the electric current which changes its polarity after same intervals of time is called $$alternating$$ $$current$$.
Write true or false for the following statements :
The magnetic field produced by a current in a straight wire has no poles .
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True
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False
Explanation
If we put a current carrying wire in a magnetic field perpendicular to its length, then it neither gets attracted or repelled by that field and hence these concentric circles neither have a starting point nor an ending point and the compass points tangential to the circles at every point.
In a cable, the green wire is the live wire.
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True
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False
Explanation
The answer to this question is false. It is because the wire with a green insulation is not usually the live wire of the electric supply. The green color wire is actually responsible for grounding purpose.
A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filing clinging to the
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North Pole is almost equal to the South Pole.
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North Pole is much more than the South Pole.
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North Pole is much less than the South Pole.
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Magnet will be same all along its length.
Explanation
The correct answer is option (A) North Pole is almost equal to the South Pole.
In an electric motor the energy transformation is:
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from electrical to chemical
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from chemical to light
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from mechanical to electrical
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from electrical to mechanical
Explanation
In an electric motor. the energy transformation is from electrical to mechanical.
Note: An electric motor is a device which converts electrical energy into mechanical energy.
Two magnetic lines of force due to a bar magnet
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Intersect at the neutral point
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Intersect near the poles of the magnet
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Intersect on the equatorial axis of the magnet
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Do not intersect at all
Explanation
The two magnetic lines of force due to a bar magnet do not intersect each other because, at the point of intersection, the compass needle would point towards two directions, which is not possible.
A magnet is placed in iron powder and then taken out, then maximum iron powder is at
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Some away from north pole
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Some away from south pole
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The middle of the magnet
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The end of the magnet
Explanation
A magnet is placed in iron powder and then taken out, then maximum iron powder is at the end of the magnet. It is because the strength of the magnetic field is maximum at the poles (ends) of the magnet.
Magnetic lines of force due to a bar magnet do not intersect because
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A point always has a single net magnetic field
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The lines have similar charges and so repel each other
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The lines always diverge from a single point
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None of these
Explanation
Magnetic lines of force due to a bar magnet do not intersect because a point always has a single net magnetic field.
The direction of magnetic field lines in a region outside the bar magnet are ......................................
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from the $$N$$ pole towards the $$S$$ pole of a magnet
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from the $$S$$ pole towards the $$N$$ pole of a magnet
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in the direction coming out from both the poles of magnet
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in the direction entering in both the poles of magnet
Explanation
A. From the $$N$$ pole towards the $$S$$ pole of a magnet.
Which of the statement given below correctly describes the magnetic field near a long, straight current-carrying conductor?
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The magnetic lines of force are in a plane, perpendicular to the conductor in the form of straight lines.
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The magnetic lines of force are parallel to the conductor on all the sides of the conductor.
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The magnetic lines of force are perpendicular to the conductor going radially outward.
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The magnetic lines of force are in concentric circles with the wire as the center, in a plane perpendicular to the conductor.
Explanation
The direction of the magnetic field caused by a long straight current-carrying wire can be found out using the right-hand thumb rule.
It will be concentric around the current-carrying conductor and in a plane perpendicular to it. [option (d) is correct].
With the help of which law the direction of magnetic field due to current carrying conductor be decided?
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Faraday's law
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Fleming's right hand rule
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Right hand thumb rule
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Fleming's left hand rule
Explanation
The direction of magnetic field due to a current carrying conductor can be decided using the Right hand thumb rule. It states that if you point your thumb in the direction of current, then the direction of curl of your fingers gives the direction of the magnetic field.
What is the field line of a magnetic field passing through the centre of current carrying circular ring?
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Circular
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Straight line
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Ellipse
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Magnetic field is zero at centre
Explanation
B. Straight line
At the centre of current carrying circular ring, the magnetic field lines are straight.
The magnetic field produced in a straight conducting wire on passing the current through it is _______.
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In the direction of current
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In the direction opposite to the current
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Circular around the wire
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None of these
Explanation
The magnetic field lines around a straight current carrying conducting wires are concentric circles whose centres lie on the wire. The direction the magnetic field lines can be determined by right-hand thumb rule.
According to right hand thumb rule, whose direction is indicated by a thumb?
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Electric current
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Magnetic field
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Magnetic force
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Motion of a conductor
Explanation
A. Electric current
Definition of right hand thumb rule: If we hold the wire in right hand in such a way that the thumb points towards the direction of current then the curled fingers on the wire gives the direction of magnetic field.
Which of the following statements is false?
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The direction of magnitude of magnetic field line is from $$N$$ to $$S$$
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In the region where the magnetic field lines are at a close distance from each other, there will be a strong magnetic field.
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The magnetic field lines from close loops.
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The magnetic field lines can cross each other.
Explanation
D. The magnetic field lines can cross each other.
If the magnetic field lines cross each other, it would mean that magnetic field has two directions at that point, which is not possible. Hence, magnetic field lines can cross each other.
The phenomenon of electro-magnetic induction is
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the process of charging a body.
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the process of generating magnetic field due to a current passing through a coil.
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producing induced current in a coil due to relative motion between a magnet and the coil.
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the process of rotating a coil of an electric motor.
Explanation
Correct Option: (C)
Explanation for correct answer :
By the name of electromagnetic induction, we can understand that by the relative motion of magnets and the coil, electric current will be induced.
Hence, the correct answer is an option (C)
Explanation for wrong answers :
As we know by the name of the process of charging in this we need to charge something so we can’t get any current from this. Hence, option (A) is the wrong answer.
As electromagnetic induction is the process to produce current but in option (B) we are passing a current. Therefore, option (B) is the wrong answer.
The process of rotating a coil of an electric motor does not produce current instead it needs current to perform such action. Therefore option (D) is the wrong answer.
Therefore, option (A), (B) and (D) are incorrect. The correct answer is option (C).
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