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JEE Main 2004 (AIEEE) · Ampere's Law, Cylinders, Solenoid & Toroid

Ampere's Law, Cylinders, Solenoid & Toroid question from JEE Main 2004 (AIEEE)

Q59JEE Main 2004 · AIEEEEasy

Ampere's Law, Cylinders, Solenoid & Toroid

A current $i$ ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is

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Answer: (b)

An Amperian loop inside the thin-walled tube encloses no current.
$\oint \vec B \cdot d\vec l = \mu_0 \times 0 \Rightarrow B = 0$ .
So the answer is (b) zero.

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