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Question

The magnetic field B at point P at a distance R due to the wire of finite length carrying current I is

A
μo4πIR
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B
μo2πIR
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C
μo2π2IR
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D
None of these
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Solution

The correct option is B μo2πIR
The magnetic field B at point P at a distance R due to a carrying current I is :
B=μoI4πR(sinα+sinβ)
For infinite long wire,
sinα=sinβ=1
B=μoI×24πR
B=μo2πIR

653032_579666_ans_5ad46ce602e24ac88dc2384f20b3c491.png

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