Torque on a Magnetic Dipole in a Uniform Magnetic Field NEET Questions

Physics - Magnetic Effects of Current and Magnetism

Torque on a Magnetic Dipole in a Uniform Magnetic Field MCQ Questions


1.
The torque on a magnetic dipole of moment m placed in a uniform magnetic field B is given by:
A.
τ = m · B
B.
τ = m × B
C.
τ = m + B
D.
τ = m/B
😑 View Answer Rough Work Error
ANSWER :
B. τ = m × B
2.
The magnitude of torque on a magnetic dipole in a uniform magnetic field is:
A.
τ = mB
B.
τ = mB tan θ
C.
τ = mB cos θ
D.
τ = mB sin θ
😑 View Answer Rough Work Error
ANSWER :
D. τ = mB sin θ
3.
The torque on a magnetic dipole is maximum when the angle between m and B is:
A.
0°
B.
45°
C.
90°
D.
180°
😑 View Answer Rough Work Error
ANSWER :
C. 90°
4.
The torque on a magnetic dipole is zero when:
A.
B is infinite
B.
m is perpendicular to B
C.
m = 0 only
D.
m is parallel or antiparallel to B
😑 View Answer Rough Work Error
ANSWER :
D. m is parallel or antiparallel to B
5.
A magnetic dipole of moment 0.5 A·m² is placed in a uniform field of 0.4 T at 30°. The torque on it is:
A.
0.05 N·m
B.
0.1 N·m
C.
0.173 N·m
D.
0.2 N·m
😑 View Answer Rough Work Error
ANSWER :
B. 0.1 N·m
6.
The direction of torque on a magnetic dipole in uniform B is:
A.
Along B
B.
Along m
C.
Along the axis of rotation
D.
Perpendicular to both m and B (in direction of m × B)
😑 View Answer Rough Work Error
ANSWER :
D. Perpendicular to both m and B (in direction of m × B)