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Questions  

lf a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be

a
only inside the pipe
b
only outside the pipe
c
both inside and outside the pipe
d
neither inside nor outside the pipe

detailed solution

Correct option is B

According to Ampere's law∮B→. dl→ =  μ0Ionly for outside point, path of line integration will enclose the current . Hence, B = 0 inside.

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