A current ` I` flows along the length of an infinitely long, straight , thin - walled pipe. Then
A
the magnetic field at all points inside the pipe is the same , but not zero.
B
the magnetic field at any points inside the pipe is zero.
C
the magnetic field is zero only on the axis of the pipe
D
the magnetic field is different at different points inside the pipe.
Text Solution
Verified by Experts
The correct Answer is:
B
Let us consider any point `p` inside the thin walleed pipe . Let us consider a circular loop and apply Ampere's circuital law, `oint vec(B).vec(dl) = mu_(0)I` Since current inside the loop is zero. :. `vec(B) = 0`
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