Target Exam

CUET

Subject

Physics

Chapter

Moving Charges and Magnetism

Question:

A current of i ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is

Options:

infinite

zero

$\frac{μ_02i}{4\pi r}$ (tesla)

$\frac{μ_0i_0}{4 r}$ (tesla)

Correct Answer:

zero

Explanation:

$ I_{enclosed} = 0$

$\Rightarrow B .2\pi r = \mu_0 I_{enclosed} = 0$