Single Choice

Which of the graphs shows the variation of magnetic induction B with distance 'r' from a long wire carrying a current?

Av
BB
CC
Correct Answer
DD

Solution

Hint:- Check the variation of Magnetic field with distance for a long current carrying wire.
Explanation:-
$$\textbf{Step1: Find variation of magnetic field with distance}$$

The magnetic field at P due to current I in wire when P is at a distance ‘r’ from wire is
$$B=\dfrac{\mu_0}{2\pi}(\dfrac{I}{r})$$
$$B\propto\dfrac{1}{r}$$


Thus option C is correct

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