1.

The force of rcpulsion 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

Answer»

4/f
4F
2f
f

Solution :`F = (mu _(0))/(4pi) (I _(1) I _(2))/(r ),` where F is FORCE per unit length of each CONDUCTOR.
`THEREFORE F prop I_(1) I _(2)`
Given` f peop I ^(2)`
`f . (2I)^(2) prop 4I^(2)`
`therefore f . =4f`


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