The strength of the magnetic field around a straight conductor:

is same everywhere around the conductor

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obeys inverse square law

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is directly proportional to the square of the distance from the conductor

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none of these

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Solution

The correct option is D none of these
The magnetic field due to straight conductor is given as $B = \frac{μ_{\circ} I}{2 π r}$ where $r$ is distance of any point P from the straight conductor, at which we want to calculate the magnetic field, which is inversely proportional to $r$ .

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The strength of the magnetic field around a straight conductor:

The correct option is D none of theseThe magnetic field due to straight conductor is given as B=μ∘I2πr where r is distance of any point P from the straight conductor, at which we want to calculate the magnetic field, which is inversely proportional to r.

The correct option is D none of these
The magnetic field due to straight conductor is given as $B = \frac{μ_{\circ} I}{2 π r}$ where $r$ is distance of any point P from the straight conductor, at which we want to calculate the magnetic field, which is inversely proportional to $r$ .