First slide

Magnetic force between two dipoles

Question

Two poles separated by 10 cm experiences a force of 5 mN. Find the force between them when the distance is doubled and the pole strengths are doubled

Easy

A

5 mN
B

10 mN
C

2.5 mN
D

1 mN

Solution

$Fα \frac{m^{2}}{d^{2}} \Rightarrow \frac{F_{f}}{F_{i}} = \frac{4 m^{2}}{4 d^{2}} / \frac{m^{2}}{d^{2}} = 1$

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