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Q.

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

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a

only inside the pipe

b

only outside the pipe

c

both inside and outside the pipe

d

neither inside nor outside the pipe

answer is B.

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Detailed Solution

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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