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JEE Main 2013 (22 Apr, Shift 1) · Magnetic Field of Straight Wires

Magnetic Field of Straight Wires question from JEE Main 2013 (22 Apr, Shift 1)

Q66JEE Main 2013 · 22 APR · SHIFT 1Easy

Magnetic Field of Straight Wires

A current $i$ is flowing in a straight conductor of length $L$ . The magnetic induction at a point on its axis at a distance $\frac{L}{4}$ from its centre will be:

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Answer: (a)

By Biot–Savart, $d\vec{B} \propto d\vec{l} \times \hat{r}$ .
For a point on the line of the conductor, $d\vec{l} \parallel \hat{r}$ , so every $d\vec{B} = 0$ .
So the answer is (a) zero.

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