A current I flows along the length of an infinitely long, straight and thin-walled pipe. Choose the correct option?

The magnetic field at all points inside the pipe is the same but not zero

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The magnetic field at any point inside the pipe is zero

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The magnetic field is zero only on the axis of the pipe

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The magnetic field is different at different points inside the pipe

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Solution

The correct option is B The magnetic field at any point inside the pipe is zero
Applying Ampere's law $\oint B . d l = μ_{0} i$ to any closed path inside the pipe, we can understand that as the currect enclosed inside it is zero, the magnetic field will be equal to zero.

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A current I flows along the length of an infinitely long, straight and thin-walled pipe. Choose the correct option?

The correct option is B The magnetic field at any point inside the pipe is zeroApplying Ampere's law ∮B.dl=μ0i to any closed path inside the pipe, we can understand that as the currect enclosed inside it is zero, the magnetic field will be equal to zero.

The correct option is B The magnetic field at any point inside the pipe is zero
Applying Ampere's law $\oint B . d l = μ_{0} i$ to any closed path inside the pipe, we can understand that as the currect enclosed inside it is zero, the magnetic field will be equal to zero.