Magnetism Question 212
Question: The torque on a bar magnet due to the earth’s magnetic field is maximum when the axis of the magnet is
[MP PMT 2004]
Options:
A) Perpendicular to the field of the earth
B) Parallel to the vertical component of the earth’s field
C) At an angle of $33 ^{\circ}$ with respect to the N-S direction
D) Along the North-South (N-S) direction
Show Answer
Answer:
Correct Answer: A
Solution:
Torque on a bar magnet in earths magnetic field (BH) is $ \tau =MB _{H}\sin \theta . $ t will be maximum if sin q = maximum i.e. q = 90o. Hence axis of the magnet is perpendicular to the field of earth.
BETA
