Magnetism

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Question 1

Which of the following is true about magnetic field lines?

  • They originate from the South Pole and terminate at the North Pole.

  • They originate from the north pole and terminate at the south pole.

  • They are always circular.

  • They can never intersect each other.

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Question 2

What is the unit of magnetic field strength?

  • Ampere

  • Tesla

  • Weber

  • Volt

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Question 3

The force on a charged particle moving in a magnetic field depends on all of the following except :

  • The charge of the particle

  • The velocity of the particle

  • The direction of the magnetic field

  • The temperature of the particle

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Question 4

Which of the following materials is not magnetic?

  • Iron

  • Cobalt

  • Copper

  • Nickel

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Question 5

Which of the following statements about Earth's magnetic field is correct?

  • The magnetic poles of the Earth coincide with the geographic poles.

  • The magnetic field of the Earth is created by its solid iron core.

  • The magnetic field of the Earth is produced by the motion of molten iron in its outer core.

  • The magnetic field does not affect compass needles.

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Question 6

If a current-carrying wire is placed in a magnetic field, the force acting on the wire will be:

  • Zero if the current is parallel to the magnetic field.

  • Zero if the current is perpendicular to the magnetic field.

  • Maximum if the current is at an angle of 45° to the magnetic field.

  • Zero if the wire is not carrying any current.

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Question 7

Which of the following devices is based on the principle of electromagnetism?

  • Electric fan

  • Electric bulb

  • Electric motor

  • Electric heater

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Question 8

In a solenoid, the magnetic field inside is:

  • Zero

  • Uniform and parallel to the axis

  • Stronger at the ends of the solenoid

  • Variable depending on the current

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Question 9

The magnetic force on a moving charged particle is maximum when:

  • The velocity and magnetic field are parallel

  • The velocity and magnetic field are perpendicular

  • The velocity is zero

  • The charge is negative

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Question 10

What is the direction of the magnetic field around a straight current-carrying conductor?

  • The magnetic field lines form straight lines along the conductor.

  • The magnetic field lines are perpendicular to the conductor

  • The magnetic field lines form concentric circles around the conductor.

  • The magnetic field lines are parallel to the current direction.

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Physics

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