CBSE Questions for Class 10 Physics Magnetic Effects Of Electric Current Quiz 7 - MCQExams.com

Find out the arrow or arrows which give the direction of conventional current flow.
481796.JPG
  • Arrow A only
  • Arrow B only
  • Arrow C only
  • Arrows A and D
  • Arrows B and E
Choose the correct option which describe the magnetic field produced by a current in a long, straight wire?
  • The field lines are radially inward to the wire
  • The field increases in strength as the distance from the wire increases.
  • The field lines are directed parallel to the wire, but opposite to the direction of the current
  • The field lines are directed radially outward from the wire
  • The field lines are concentric circles with the wire passing through the center
The diagram below shows a wire carrying current towards the top off the page. A positively charged particle is shown moving directly toward the left side of the page at a particular instant.
What is the direction of the force on the positively charged particle at the instant shown, due to the magnetic field produced by the current in the wire?
494411_b4b64f9d457f407aae440925cfff2910.png
  • towards the top of the page
  • towards the bottom of the page
  • into the page
  • out of the page
  • towards the right side of the page
Below a negatively charged particle is pictured moving north east through a magnetic field that points straight up. What is the direction of the force on the negatively charged particle at the moment it is pictured?
494383_8a94ded4e1824eba85ee02b9369f3ef8.png
  • northeast
  • southeast
  • southwest
  • northwest
  • up
A wire placed within a magnetic field has a current flowing in it as shown in the above figure. Identify the direction of the force exerted by the magnetic field on the wire.
480764_a5907ed1c5074ea3a93f3b1416a5b234.png
  • Point $$A$$
  • Point $$B$$
  • Point $$C$$
  • Point $$D$$
  • No forces are exerted on the wire
The diagram below shows a positively charged particle moving toward the right and about to enter a magnetic field whose direction is shown by the blue arrows. What is the direction of the force on the positively charged particle (from our point of view) at the instant it enters the magnetic field?
494376_8276b1f0b584450f877d6757e2083163.png
  • right
  • left
  • up
  • toward us
  • away from us
Which converts mechanical energy into electrical energy
  • Motor
  • Battery
  • Generator
  • Switch
Direction of induced EMF can be found from
  • Lenz law
  • Laplace law
  • Fleming law
  • None of the above
In above shown figure, the direction of magnetic force and magnetic field is given then find out the direction of the particle velocity, v.
480716.JPG
  • To the right
  • Downward, in the plane of the page
  • Upward, in the plane of the page
  • Out of the plane of the page
  • Into the plane of the page
An electron enters with a velocity $$v$$ to the right in a magnetic field $$B$$, also to the right. What direction is the force $$F$$ on the electron?
496771.png
  • An upward force
  • A downward force
  • A force to the left
  • No force if felt
The diagram below shows a wire carrying conventional current in the direction shown by the red arrows.
The magnetic field is straight downward, as indicated by the blue X's.
What is the direction of the force exerted by the magnetic field on the wire?
498299.jpg
  • Upward
  • Downward
  • Northward
  • Southward
  • Westward
The magnet is strongest near the
  • Poles of the magnet
  • Ends of the magnet
  • Centre of the magnet
  • One quarter point from the poles of the magnet
A positive charge is at rest in a uniform magnetic field directed to the right. What force does the positive charge feel, due to the magnetic field?
  • An upward force.
  • A downward force.
  • A force to the left.
  • No force is felt.
A straight wire carries current toward the east.
What is the direction of the magnetic field directly below the wire?
  • Northward
  • Southward
  • Eastward
  • Westward
  • Up
A straight wire carries conventional current toward the sky.
What is the direction of the magnetic field due to the current at a point west of the wire?
  • North
  • South
  • East
  • West
  • Up
As a negatively charged bowling ball rolls eastward toward some bowling pins, in what direction does it experience a force, due to the earth's magnetic field (Assume the earth's field is pointing straight north)?
  • North
  • South
  • East
  • West
  • Down
All of the following magnets pictured have magnetic field lines like the ones pictured in the diagram above. For which one are the poles correctly labeled?
498276_dd6debcc14ee4c2d9237753749a17a18.png
An electron enters a magnetic field directed to the right, with a velocity toward the bottom of the screen. What is the direction of the force on the electron?
496772_a605b79c1fd74b519c14d91111ea628b.png
  • To the left
  • Into the screen
  • To the right
  • Out of the screen
The magnetic field lines due to a bar magnet correctly shown are:
Energy in a current - carrying coil is stored in the form of :
  • Electric field
  • Magnetic field
  • Dielectric strength
  • Heat
Which of the following figures depict non uniform magnetic field?
The magnetic lines of force due to a bar magnet are
  • Curved lines
  • Curved closed loops
  • Concentric circles
  • Parallel and straight
In alternating current:
  • The direction of current is always positive
  • The direction of current is always negative
  • The direction of current changes constantly
  • None of these
For the given distribution the magnetic field at point, $$P$$ is

1182121_c485d0948f72402a8bea6af6d8e2184c.png
  • $$\dfrac{\mu _0}{4\pi}\bigodot$$
  • $$\dfrac{\mu _0}{\pi}\bigotimes$$
  • $$\dfrac{\mu _0}{2\pi}\bigotimes$$
  • $$\dfrac{\mu _0}{2\pi}\bigodot$$
Which of the following electrical devices works on the principle of electro-magnetic induction ?
  • Electric fan
  • Electric bulb
  • Electric cooker
  • L.E.D.
Electromagnetic induction is not used in :
  • Transformer
  • Room heater
  • AC generator
  • Choke coil
The phenomenon of producing an emf in a circuit whenever the magnetic flux linked with a coil changes is ................................
  • Electro-magnetic induction
  • Inducing current
  • Inducing voltage
  • Change in current
Electromagnetic induction is not used in
  • Transformer
  • Room heater
  • AC generator
  • Choke coil
A beam of protons is moving horizontally towards you. As it approaches you, it passes through a magnetic field which is directed upwards. As you see it, the magnetic field will deflect the beam to the:
  • Right
  • Left
  • Top
  • Bottom
Which one of the following statements best describes the nature of the field lines due to a bar magnet?
  • Field lines start from the north pole and end on the south pole. Any number of field lines can pass through a point
  • Field lines start from the north pole and end on the south pole. Only one field line passes through a point
  • Field lines are continuous lines passing inside and outside the magnet. Only one field line passes through a point
  • Field lines are continuous lines passing inside and outside the magnet. Any number of field lines can pass through a point
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