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NEET 1999 (AIPMT) · Magnetic Field of Straight Wires

Magnetic Field of Straight Wires question from NEET 1999 (AIPMT)

Q71NEET 1999 · 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 another wire of diameter $1\text{ mm}$ carrying the same current. The strength of magnetic field far away is

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Answer: (d)

Far from the wire $B = \frac{\mu_0 I}{2\pi r}$ , independent of the wire's thickness.
Current is unchanged, so $B$ is unchanged.
So the answer is (d) same as earlier value.

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