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


7.
A current loop carrying current I has area A. Its magnetic moment in a field B produces torque:
A.
τ = BA/I
B.
τ = IAB sin θ = mB sin θ
C.
τ = IA + B
D.
τ = IA/B
😑 View Answer Rough Work Error
ANSWER :
B. τ = IAB sin θ = mB sin θ
8.
A bar magnet has magnetic moment 2 A·m² and is placed in uniform field 0.1 T perpendicular to it. The torque is:
A.
0.05 N·m
B.
2 N·m
C.
0.1 N·m
D.
0.2 N·m
😑 View Answer Rough Work Error
ANSWER :
D. 0.2 N·m
9.
A magnetic dipole of moment 0.1 A·m² is placed in a uniform field 0.5 T. The maximum torque it can experience is:
A.
5 N·m
B.
0.1 N·m
C.
0.05 N·m
D.
0.5 N·m
😑 View Answer Rough Work Error
ANSWER :
C. 0.05 N·m
10.
The net force on a magnetic dipole in a uniform magnetic field is:
A.
mB sin θ
B.
Zero
C.
mB
D.
qB
😑 View Answer Rough Work Error
ANSWER :
B. Zero
11.
A magnetic dipole placed at an angle θ with field B. The potential energy of the system is:
A.
U = mB
B.
U = -mB cos θ (= -m·B)
C.
U = mB cos θ
D.
U = mB sin θ
😑 View Answer Rough Work Error
ANSWER :
B. U = -mB cos θ (= -m·B)
12.
A dipole of magnetic moment 0.2 A·m² is in uniform field 5 T. The torque when moment makes 60° with field:
A.
0.5 N·m
B.
0.1 N·m
C.
1 N·m
D.
0.866 N·m
😑 View Answer Rough Work Error
ANSWER :
D. 0.866 N·m