Chapter 4: Moving Charges and Magnetism MCQs | physics Class 12 CBSE

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Chapter 4: Moving Charges and Magnetism MCQs | physics Class 12 CBSE | ByteNotes.in

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Question 1

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A charged particle moves in a magnetic field such that the magnetic force on it is zero. Which of the following is a correct reason?

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Medium

Question 2

Objective

The SI unit of magnetic field B is tesla. Which of the following correctly expresses 1 tesla in terms of base SI units?

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Medium

Question 3

Objective

A proton and an alpha particle enter a uniform magnetic field perpendicular to it with the same speed. The ratio of the radius of the proton's circular path to that of the alpha particle is:

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Question 4

Objective

The work done by the magnetic force on a moving charged particle in a uniform magnetic field is:

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Question 5

Objective

A straight wire of length l carrying current I is placed in a uniform magnetic field B at angle θ to the field. The force on the wire is:

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Easy

Question 6

Objective

Two long parallel wires carry currents in opposite directions. The force between them is:

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Medium

Question 7

Objective

In the Biot-Savart law, the magnetic field dB due to a current element I dl at a point P is proportional to:

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Question 8

Objective

The value of the permeability of free space μ₀ in SI units is:

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Question 9

Objective

The magnetic field at the centre of a circular loop of radius R carrying current I is B₀. If the radius is halved and the current is doubled, the new field at the centre is:

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Question 10

Objective

According to Ampere's circuital law, for a long straight wire carrying current I, the magnetic field at distance r is:

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Question 11

Objective

Inside a long solenoid of n turns per unit length carrying current I, the magnetic field is:

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Medium

Question 12

Objective

The cyclotron frequency of a charged particle in a magnetic field is independent of:

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Question 13

Objective

A rectangular current loop is placed in a uniform magnetic field. The net translational force on the loop is:

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Question 14

Objective

The torque on a current loop of N turns, area A, carrying current I, in a uniform magnetic field B when the plane of the loop is parallel to B is:

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Question 15

Objective

The magnetic moment of a current loop has the SI unit:

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Question 16

Objective

In a moving coil galvanometer, the radial magnetic field is used so that:

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Easy

Question 17

Objective

A galvanometer is converted to an ammeter by connecting:

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Question 18

Objective

A galvanometer is converted to a voltmeter by connecting:

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Hard

Question 19

Objective

If the number of turns in a moving coil galvanometer is doubled (keeping all other parameters constant), its voltage sensitivity:

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Medium

Question 20

Objective

The pitch of the helical path of a charged particle moving in a magnetic field is:

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Chapter 4: Moving Charges and Magnetism | MCQs

A charged particle moves in a magnetic field such that the magnetic force on it is zero. Which of the following is a correct reason?

The SI unit of magnetic field B is tesla. Which of the following correctly expresses 1 tesla in terms of base SI units?

A proton and an alpha particle enter a uniform magnetic field perpendicular to it with the same speed. The ratio of the radius of the proton's circular path to that of the alpha particle is:

The work done by the magnetic force on a moving charged particle in a uniform magnetic field is:

A straight wire of length l carrying current I is placed in a uniform magnetic field B at angle θ to the field. The force on the wire is:

Two long parallel wires carry currents in opposite directions. The force between them is:

In the Biot-Savart law, the magnetic field dB due to a current element I dl at a point P is proportional to:

The value of the permeability of free space μ₀ in SI units is:

The magnetic field at the centre of a circular loop of radius R carrying current I is B₀. If the radius is halved and the current is doubled, the new field at the centre is:

According to Ampere's circuital law, for a long straight wire carrying current I, the magnetic field at distance r is:

Inside a long solenoid of n turns per unit length carrying current I, the magnetic field is:

The cyclotron frequency of a charged particle in a magnetic field is independent of:

A rectangular current loop is placed in a uniform magnetic field. The net translational force on the loop is:

The torque on a current loop of N turns, area A, carrying current I, in a uniform magnetic field B when the plane of the loop is parallel to B is:

The magnetic moment of a current loop has the SI unit:

In a moving coil galvanometer, the radial magnetic field is used so that:

A galvanometer is converted to an ammeter by connecting:

A galvanometer is converted to a voltmeter by connecting:

If the number of turns in a moving coil galvanometer is doubled (keeping all other parameters constant), its voltage sensitivity:

The pitch of the helical path of a charged particle moving in a magnetic field is:

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