Two parallel wires carry currents of 20A and 40A in opposite directions.

Monjur Alahi

Two parallel wires carry currents of 20A and 40A in opposite directions. Another wire carrying a current antiparallel to 20A is placed midway between the two wires. The magnetic force on it will be 

(a) towards 20A 

(b) towards 40A 

(c) zero 

(d) perpendicular to the plane of the currents.


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Salim Ahmed Kawsar

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(b) Towards 40A

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