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Question

What is the magnetic field dB at a distance r due to a small current element dl carrying current I?
 


A
dB=μ04πi(dl×rr)
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B
dB=μ04πi2(dl×rr)
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C
dB=μ04πi2(dl×rr2)
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D
dB=μ04πi(dl×rr3)
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Solution

The correct option is D dB=μ04πi(dl×rr3)
dB=μ04π.idl sin θr2  dB=μ04π.i(dl×r)r3

Physics

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