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  • If a long hollow copper wire carries a current, then the magnetic field is producedOption: 1 inside the pipe only<div class='qna-option

If a long hollow copper wire carries a current, then the magnetic field is produced

Option: 1

inside the pipe only


Option: 2

outside the pipe only


Option: 3

both inside and outside


Option: 4

nowhere


Answers (1)

best_answer

Inside a hollow pipe carrying current, the magnetic field is zero, since according to ampere's law

B_i \cdot 2 \pi r=\mu_0 \times 0 \Rightarrow B_i=0

But for external points, the current behaves as if it was concentrated at the axis only, so outside,

B_0=\frac{\mu_0 i}{2 \pi r}

Thus the magnetic field is produced outside the pipe only.

Posted by

shivangi.bhatnagar

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