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NEET 1997 (AIPMT) · Magnetic Field of Straight Wires

Magnetic Field of Straight Wires question from NEET 1997 (AIPMT)

Q72NEET 1997 · AIPMTEasy

Magnetic Field of Straight Wires

A straight wire of diameter $0.5\text{ mm}$ carrying a current of $1\text{ A}$ is replaced by the another wire of $1\text{ mm}$ diameter carrying the same current. The strength of the magnetic field far away is

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Answer: (d)

Outside the wire $B = \frac{\mu_0 I}{2\pi r}$ ; the diameter does not enter.
Same current gives the same field.
So the answer is (d) same as the earlier value.

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