A coil having N turns is wound | EMF

JEE MAIN 2021

31.08.21_S2

Question

A coil having N turns is wound tightly in the form of a spiral with inner and outer radii 'a' and 'b' respectively. Find the magnetic field at centre, when a current I passes through coil

Select the correct option:

$\frac{\mu_0 \mathbb{N}}{2(b-a)} \log _e\left(\frac{b}{a}\right)$

$\frac{\mu_0 l}{8}\left[\frac{a+b}{a-b}\right]$

$\frac{\mu_0 \mathrm{I}}{4(\mathrm{a}-\mathrm{b})}\left[\frac{1}{\mathrm{a}}-\frac{1}{\mathrm{~b}}\right]$

$\frac{\mu_0 \mathrm{l}}{8}\left[\frac{1-\mathrm{b}}{\mathrm{a}+\mathrm{b}}\right]$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

Question Tags

JEE Main

Physics

Easy

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