Question

A current $I$ ampere flows along an infinitely long straight thin walked tube, then the magnetic induction at any point inside the tube is

• A. infinite
• B. zero
• C. $\frac{{\mu }_0}{4\pi }\frac{2i}{r}tesla$
• D. $\frac{2i}{r}tesla$

Answer 1

The correct option is B zero

Magnetic Induction $B=\frac{{\mu }_o}{4\pi }\frac{I}{r}\theta$

Here, $\theta =0$

$\therefore B=0$ .