First slide

Magnetism

Question

What is the expression for the minimum potential energy of magnet

Easy

A

$U = 0$
B

$U = + M B$
C

$U = - M B$
D

$U = 2 M B$

Solution

P.E of the magnet is $U = - M B \cos θ$
If $θ = 0^{0}$

$U = - M B (M i n i m u m)$ stable equilibrium

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