P and Q are two points at distances 10 cm and 20 cm from the axis of a long thin straight current carrying wire. Then the ratio of magnetic energy densities at P and Q is

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

2 : 1

4 : 1

8 : 1

16 : 1

answer is B.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

(2)At distance r from the axis of a current carrying wire,B=μ0i2πr and magneticenergy density u=B22μ0 = μ0i28π2.r2 ⇒ u ∝ 1r2∴ uPuQ= 20102=4

Watch 3-min video & get full concept clarity