Bar Magnet & Dipole Field — Practice Quiz

Question 1

Ratio of axial to equatorial field of a short bar magnet at equal distance:

Accepted Answer

2:1

Answer

1:1

Answer

1:2

Answer

4:1

Question 2

A bar magnet of length 2L has magnetic moment m. If broken at the middle:

Accepted Answer

Two magnets each with moment m/2

Answer

Two magnets each with moment m

Answer

Two magnets with poles isolated

Answer

One magnet of moment 2m

Question 3

Magnetic field along the axis of a short bar magnet at distance 0.1 m is B. At distance 0.2 m, field is:

Accepted Answer

B/8

Answer

B/2

Answer

B/4

Answer

B/16

Question 4

Magnetic dipole moment of a current loop is:

Accepted Answer

N·I·A

Answer

I·L

Answer

N²·I·A

Answer

B·A

Question 5

Torque on a magnetic dipole in a uniform B is maximum when:

Accepted Answer

m perpendicular to B

Answer

m parallel to B

Answer

m antiparallel

Answer

B = 0