Questions
A current flows along the length of an infinitely long, straight and thin-walled pipe. Then
a
The magnetic field at all points along the axis of the pipe is only zero
b
The magnetic field at any point 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
detailed solution
Correct option is B
Applying Ampere's law ∮B. dl = μ0i to any closed path inside the pipe we find no current is enclosed. Hence B = 0.Talk to our academic expert!
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Magnetic induction on the surface of a long current carrying wire of radius R is 8 µT. Then magnetic induction at a distance R/4 from the axis of the conductor is
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