First slide

The bar magnet

Question

The magnetic moment of a short magnet is 8 amp-m². What is the magnetic induction at a point 20 cm away on its equatorial line from its mid-point ?

Easy

A

10^-4 web/m²
B

2 x 10^-4 web/m²
C

3 x 10^-4 web/m²
D

4 x 10^-4 web/m²

Solution

$B = \frac{μ_{0}}{4 π} \times \frac{M}{d^{3}} ∴ B = \frac{10^{- 7} \times 8}{{(20 \times 10^{- 2})}^{3}} = 10^{- 4} web / m^{2}$

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