A bar-magnet of the pole-strength 2 Amp-m is kept in a magnetic field of induction…
PHYSICS · Subjective · CBSE · Physics · Magnetism and Matter · Magnetism and Matter
Problem
A bar-magnet of the pole-strength 2 Amp-m is kept in a magnetic field of induction 4×10−5 Wb/m 2 such that the axis of the magnet makes an angle 30∘ with the direction of the field. If the couple acting on the magnet is found to be 80×10−7 Nm, then the distance between the poles of the magnet is:
a) 20 cm
b) 4 m
c) 2 m
d) 8 m