Magnetic Effects of Current and Magnetism (NEST (National Entrance Screening Test) Physics): Questions 1 - 3 of 3

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Question number: 1

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

Appeared in Year: 2008

MCQ▾

Question

A proton moves in the direction after being accelerate from rest through a potential difference . It then passes through a region with uniform electric field in the direction and a uniform magnetic field in the direction, but the proton’s trajectory is not affected. If the experiment is repeated using a potential difference of , the proton will be deflected in –

Choices

Choice (4) Response

a.

the direction

b.

the direction

c.

the direction

d.

the direction

Question number: 2

» Magnetic Effects of Current and Magnetism » Ampere's Law

Appeared in Year: 2015

MCQ▾

Question

A tiny bar magnet is kept close to a long current carrying straight wire placed along the axis. When the centre of the magnet is at and it is oriented along the axis, it experiences –

Choices

Choice (4) Response

a.

A net force but not net torque

b.

Neither net force nor net torque.

c.

A net force and a net torque

d.

Not net force but a net torque.

Question number: 3

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

Appeared in Year: 2014

MCQ▾

Question

The figure below depicts a circular loop of radius carrying a fixed current . The upper half of the loop is placed in a uniform magnetic field of magnitude , perpendicular to the plane of the paper, as shown. The magnitude of the force on the loop is (neglect gravity) –

Half loop placed in magnetic field

Half Loop Placed in Magnetic Field

In figure a circular loop carrying fixed current I. The upper half of the loop is placed in a uniform magnetic field

Choices

Choice (4) Response

a.

b.

c.

d.

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