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A condutor carrying current I is placed ...

A condutor carrying current `I` is placed parallel to a current per unit width `j_(0)` and width `d`, as shown in the Find the force per unit length on the conductor
.

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Verified by Experts

The correct Answer is:
B
Field due to strip `B=(mu_(0)j_(0))/pi tan^(-1)(d/(2h))` towards `x` axis
Force on unit length `dl` of wire
`dvecF=i[dlhatjxxBhati]`
`rArr (dF)/(dl)=(mu_(0)j_(0))/pi tan^(-1)(d/(2h))(-hatk)`
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