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Question

# Two parallel current carrying conductors carrying the same current 'I' in the same direction are seperated by a distance r. Force experienced per unit length by each conductor will be?

A
Repulsive and F=μ0I24πr
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B
Attractive and F=μ02I24πr
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C
Repulsive and F=μ02I24πr
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D
Attractive and F=μ0I24πr
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Solution

## The correct option is B Attractive and F=μ02I24πr The magnetic field at one of the wires due to the other is: B=2μI4πr Therefore, the force per unit length experienced by the wire will be F=BI=2μI24πr Also when the current is in the same direction then the force between the wires will be attractive in nature.

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