Official PYQ · 2012Set 1 · Q53MCQ2 marks

GATE EC 2012 Set 1 Q53 — Electronic Devices

An infinitely long uniform solid wire of radius $a$ carries a uniform dc current of density $\overrightarrow{j}$ .

A hole of radius $b$ (b < a) ia now drilled along the length of the wire at a distance $d$ from the center of the wire as shown below.

The magnetic field inside the hole is

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Answer: A

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Published 10 Oct 2026

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