JEE Main20252 Apr 2025Evening ShiftPhysicsMagnetic Properties of MatterActual
A solenoid having area A and length ' l ' is filled with a material having relative permeability 2. The magnetic energy stored in the solenoid is :
Options
- AB ^2 ~A l ₀
- BB ^2 ~A l 2 ₀
- CB ^2 Al
- DB ^2 ~A l 4 ₀
Correct answer
D. B ^2 ~A l 4 ₀
Step-by-step solution
U V = B ^2 2 _ r u ₀ U = B ^2 4 ₀ ~V = B ^2 4 ₀ ~A