CBSE Questions for Class 10 Physics Magnetic Effects Of Electric Current Quiz 5 - MCQExams.com

The magnetic field inside a solenoid is:
  • infinite
  • zero
  • uniform
  • non-uniform
The following diagram shows a spiral coil wound on a hollow cardboard tube AB. A magnetic compass is placed close to it. Current is switched on by closing the key. What will be the polarity at the ends A and B?
176797_9a529b3db2e24b5dbeb3d13243b1bcdb.png
  • A - north pole, B - south pole
  • A - south pole, B -north pole
  • A - south pole, B - south pole
  • A - north pole, B - north pole
According to Fleming's Left Hand Rule, the ....... points in the direction of the magnetic field.
  • Thumb
  • Forefinger
  • Second finger
  • Middle finger
A pair of slip rings is used in -
  • Ac generator
  • Dc generator
  • Ac motor
  • Dc motor
A very long straight wire carries a current $$I$$. At the instant when a charge $$+Q$$ at point $$P$$ has velocity $$\overrightarrow{v}$$, as shown in figure, the force on charge is

142858_a951747e6dab4ce88012b3688302eeea.png
  • along OY
  • opposite to OY
  • along OX
  • opposite to OX
In the following figure, three path of a particle crossing a nucleus N are shown. The correct path is

143508.png
  • a and c
  • a and b
  • a, b, and c
  • only a
The adjacent diagram shows a small magnet placed near a solenoid AB with its north pole N near the end A. Current is switched on in the solenoid by pressing the key K. State the polarity at the ends A and B:
176790.jpg
  • A - south pole, B - north pole
  • A - south pole, B - south pole
  • A - north pole, B - north pole
  • A - north pole, B - south pole
The adjacent diagram shows a small magnet placed near a solenoid AB with its north pole N near the end A. Current is switched on in the solenoid by pressing the key K. Magnet will get :

176791.jpg
  • Attracted
  • Repelled
  • No change
  • can't say
An electron having a charge $$e$$ moves with a velocity $$v$$ in X-direction. A magnetic field acts on it in Y-direction. The force on the electron acts in
  • positive direction of Y-axis
  • negative direction of Y-axis
  • positive direction of Z-axis
  • negative direction of Z-axis
The following diagram shows a spiral coil wound on a hollow cardboard tube AB. A magnetic compass is placed close to it. Current is switched on by closing the key. How will the compass needle be affected ? Give reason.
180679_77e2c370a0ae4e5cbf6000ec4868b952.png
  • The north pole of compass needle will deflect towards north.
  • The north pole of compass needle will deflect towards east.
  • The north pole of compass needle will deflect towards west.
  • The north pole of compass needle will deflect towards south.
How will be the direction of force will get changed, if the current is reversed in the conductor placed in a magnetic field?
  • Direction of force rotates by right angle
  • Direction of force is reversed.
  • Direction of force remains same
  • Can't say
How is the magnetic field due to a solenoid carrying current affected if a soft iron bar is introduced inside the solenoid?
  • Magnetic field increases
  • Magnetic field decreases
  • Magnetic field remains same
  • Cannot say
The diagram shows a coil wound around a soft iron bar XY. State the polarity at the ends X and Y as the switch is pressed
176816_242c157013a34694809dfa7968cb1491.png
  • X-north pole, Y-south pole
  • X-north pole, Y-north pole
  • X-south pole, Y-south pole
  • X-south pole, Y-north pole
What effect will there be on a magnetic compass when it is brought near a current carrying solenoid?
  • The needle of the compass will rest in the direction of magnetic field due to solenoid at that point.
  • The needle of the compass will rest in the direction opposite to magnetic field due to solenoid at that point.
  • No effect
  • Cannot say
Why does a current carrying freely suspended solenoid rest along a particular direction?
  • It points towards the geometric poles of the earth
  • A current carrying solenoid behaves like a bar magnet
  • It points in the direction of the flow of current
  • None of the above
The __________ in a magnetic field is called magnetic lines of force.
  • Open curves
  • Closed curves
  • Circles
  • Polygons
State condition when magnitude of force on a current carrying conductor placed in a magnetic field is zero.
  • When current in conductor is normal to the direction of magnetic field
  • When current in conductor is in the direction of magnetic field
  • When current in conductor is acute angled to the direction of magnetic field
  • When current in conductor is obtuse angled to the direction of magnetic field
How will the direction of force be changed, if the current is reversed in the conductor placed in a magnetic field ?
  • No direction.
  • Direction of force is reversed.
  • Direction of force remains same.
  • cant say
Of the following figure, the lines of magnetic induction due to a magnet $$SN$$, are given by :

205323_8b3981fac8984a5ca95b5cd6114a08a0.png
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
On the basis of following features identify the correct option 
I. They always start from north pole and end at the south pole of the magnet outside the magnet.
II. They never intersect each other.
  • Electric lines of force
  • Magnetic lines of force
  • Both (1) and (2)
  • Neither (1) nor (2)
Which part  has maximum attraction in a magnet ?
  • In the centre
  • On the sides
  • On the poles
  • On the surface
A soft iron bar is enclosed by a coil of insulated copper wire as shown in figure. When the plug of the key is closed, the face B of the iron bar marked as:
208305_a9a6a36161464345af6354455f946834.png
  • N-pole
  • S-pole
  • N-pole if current is large
  • S-pole if current is small
When a steel core is placed in a solenoid, it acts like an electromagnet.        
  • True
  • False
Household electrical appliances are joined using .......... combination of resistors.
  • Parallel
  • Alternating
  • Continuous
  • Series
Study involving both electricity and magnetism is called ______.
  • electromagnetism
  • magnetoelectricism
  • electricmagnetism
  • magneticelectromerism
The figure shows a circuit containing a coil wound over a long and hollow thin tube. Copy the diagram and show the polarity required by each face of the solenoid.
285698.png
  • Current enters the solenoid from face $$B$$, hence this end of solenoid is south pole and the face $$A$$ is north pole.
  • Current enters the solenoid from face $$B$$, hence this end of solenoid is north pole and the face $$A$$ is south pole.
  • Current enters the solenoid from face $$A$$, hence this end of solenoid is south pole and the face $$B$$ is north pole.
  • None of these
When a solenoid that is carrying current is freely suspended it comes to rest along a particular direction. Why does this happen ?
  • Because it is suspended in air
  • Because it aligns itself along Earth's magnetic field 
  • Because current is passing through it
  • Because it is a coil
What is the relationship between an electric current and a magnetic field?
  • An electric current creates magnetic field
  • A changing magnetic field induce an electric current
  • Both $$A$$ and $$B$$
  • None of these
The magnetic field produced by a solenoid is different from the magnetic field produced by a bar magnet.
  • True
  • False
You are sitting in a room in which a strong magnetic field is directed from your left towards right. A beam of electrons is directed from front towards you. What would be the direction of magnetic force on this beam ?
  • downwards.
  • upwards.
  • towards right 
  • towards left 
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