Two long conductors, separated by a distance 'd' carry currents ' I 1 ' and ' I 2 ' in the same directions. They exert a force ' F ' on each other. Now the

Question

Two long conductors, separated by a distance 'd' carry currents ' I 1 ​ ' and ' I 2 ​ ' in the same directions. They exert a force ' F ' on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to ' 3 d . The new value of the force between them is

TestHub · Accepted Answer

Force on each conductor is given by F = 4 π μ 0 ​ ​ ⋅ d I 1 ​ I 2 ​ ​ ℓ This force will be attractive. If the direction of current is reversed in one conductor, the force will become repulsive. ∴ F ′ = − 4 π μ 0 ​ ​ ⋅ 3 d 2 I 1 ​ I 2 ​ ​ ⋅ ℓ = − 3 2 ​ F

Physics - Magnetism Question with Solution | TestHub

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