MagnetismHard

Question

Two long conductors, separated by a distance d carry current I1 and I2 in the same direction. They exert a force F on each other. Now the current in one of them increased to two times and its direction reversed. The distance is also increased to 3d. The new value of the force between them is

Options

A.- 2F
B.F/3
C.- 2F/3
D.- F/3

Solution

Force between two long conductor carrying current
   
According to question
   
From equation (i) and (ii), F′ = - F.

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