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


13.
Work done in rotating a magnetic dipole from angle θ₁ to θ₂ against uniform field B is:
A.
W = mB(cos θ₁ - cos θ₂)
B.
W = mB(θ₂ - θ₁)
C.
W = mB(cos θ₂ - cos θ₁)
D.
W = mB(sin θ₁ - sin θ₂)
😑 View Answer Rough Work Error
ANSWER :
A. W = mB(cos θ₁ - cos θ₂)
14.
Work done to rotate a magnetic dipole from stable equilibrium (θ = 0°) to perpendicular (θ = 90°) in field B is:
A.
mB/2
B.
mB
C.
2mB
D.
0
😑 View Answer Rough Work Error
ANSWER :
B. mB
15.
Work done to rotate dipole from stable (θ = 0°) to unstable (θ = 180°) equilibrium is:
A.
mB
B.
mB/2
C.
2mB (maximum work)
D.
0
😑 View Answer Rough Work Error
ANSWER :
C. 2mB (maximum work)
16.
A magnetic dipole in external field at stable equilibrium has potential energy:
A.
-mB (minimum)
B.
mB/2
C.
0
D.
+mB
😑 View Answer Rough Work Error
ANSWER :
A. -mB (minimum)
17.
At unstable equilibrium (m antiparallel to B), the potential energy is:
A.
0
B.
mB/2
C.
-mB
D.
+mB (maximum)
😑 View Answer Rough Work Error
ANSWER :
D. +mB (maximum)
18.
Stable equilibrium of magnetic dipole in field corresponds to:
A.
m antiparallel to B
B.
m = 0
C.
m parallel to B (θ = 0°)
D.
m perpendicular to B
😑 View Answer Rough Work Error
ANSWER :
C. m parallel to B (θ = 0°)