A bar magnet with a magnetic moment 5,0 Am 2 is placed in parallel position relative to a magnetic field of 0.4 T. The amount of required work done in turning the magnet form parallel to antiparallel position relative to the field direction is________.
Text Solution
Verified by ExpertsThe correct answer is:
A
u = - MB cosθ
W = 
n
W = - MB cos 180° (- mB cos0°)
W = 2 MB = 2 x 5 x 0.4 = 4J
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