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Question

The force of repulsion between two parallel wires is F when each one of them carries a certain current I. If the current in each is doubled, the force between them would be
  1. 8F
  2. 4F
  3. 2F
  4. F

A
8F
B
4F
C
2F
D
F
Solution
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The force per unit length on a current carrying wire due to another current carrying wire placed at a distance d from it is

Fl=μ0I1I22πd

Hence when current in both wires is doubled, the force of repulsion becomes four times of that before.

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