First slide

The bar magnet

Question

Two identical isolated poles are separated by a distance of 3mm along a vertical line are at equilibrium. If the mass of each pole 50gr-wt Then pole strength of each is

Moderate

A

6.64amp x m
B

2amp x m
C

10.25amp x m
D

None of these

Solution

$\frac{μ_{0}}{4 π} \frac{6 M^{2}}{d^{4}} = mg \frac{10^{- 7} x 6 M^{2}}{{(0.3 x 10^{- 2})}^{4}} = 50 x 10^{- 3} x 9.8, m = \frac{M}{2 l} m = 6.64 Am$

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