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Question

A current i is flowing in a straight conductor of length L. The magnetic field at a point distant L4 from its centre will be 


A
4μ0i5πL
 
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B
4μ0i2πL
 
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C
μ0i2L
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D
Zero
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Solution

The correct option is C 4μ0i5πL
 


By using B=μ04π.ia(sinϕ1+sinϕ2)
 B=μ04π.i(L/4)(2sinϕ)
Also sinϕ=L/25L/4=25
 B=4μ0i5πL

Physics

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