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Definition of Ampere

The magnetic ...

Question

The magnetic field $B$ at a distance $r$ from a long straight wire carrying current varies with distance $r$ as shown in the figure.

A

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B

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C

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D

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Solution

The correct option is C
The magnetic field $B$ at a distance $r$ from a long straight wire carrying current $I$ is given by

$B = \frac{μ_{0} I}{2 π r} ∴ B \propto \frac{1}{r}$

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Definition of Ampere

Standard XII Physics

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