Indian Navy SSR (Sailor) Moving Charges and Magnetism — practice questions

Explore 2 free Moving Charges and Magnetism questions in Indian Navy SSR (Sailor) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Moving Charges and Magnetism questions and exercises with answers

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The magnetic force on a charge q moving with velocity v in field B:Read the answer and worked solution →For a current loop in a non-uniform magnetic field, net force is zero only if:Read the answer and worked solution →

Worked practice questions

The magnetic force on a charge q moving with velocity v in field B:

qE
qvB sin theta
q²B
qB/v

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Correct answer: B. qvB sin theta

F = qv × B. Magnitude F = qvB sin theta where theta is angle between v and B. Direction perpendicular to both v and B.

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For a current loop in a non-uniform magnetic field, net force is zero only if:

Field is zero
Field is UNIFORM (constant in space)
Loop is small
Current is small

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Correct answer: B. Field is UNIFORM (constant in space)

In uniform B, all parts of the loop experience equal and opposite forces — net force zero (but torque can be nonzero). In non-uniform B, opposite sides of loop see different B, leading to net force (causes a magnetic dipole to be pulled toward higher field regions for an aligned moment).