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.

According to question

From equation (i) and (ii), F′ = -
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