Two parallel long wires carry the same current and repel each other with a force F per unit length.If both these currents are doubled and the wire separation tripled, the force per unit length becomes:
A)2F/9
B)4F/9
C)2F/3
D)4F/3
E)6F

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The Answer of Two parallel long wires carry the same current and repel each other with a force F per unit length.If both these currents are doubled and the wire separation tripled, the force per unit length becomes:
A)2F/9
B)4F/9
C)2F/3
D)4F/3
E)6F

Two Parallel Long Wires Carry the Same Current and Repel