Q. 285.0( 1 Vote )

Two parallel wires separated by a distance of 10 cm carry currents of 10 A and 40 A along the same direction. Where should a third current be placed so that it experiences no magnetic force?

Answer :

Let x be the distance of the wire W3 from the wire carrying a current of 10A.



Magnetic force acting per unit length on a wire due to a parallel current-carrying wire is given by



In this case as the wire W3 experiences no magnetic force.


by wire w1 = by wire w2



10 – x = 4x


x = 2 cm


Thus, wire W3 is placed 2 cm from the 10 A current wire.


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