Question

Ques. A solenoid of inductance 2H carries a current of 1 A. What is the magnetic energy stored in a solenoid ?

(1) 2 J (2) 1 J
(3) 4 J (4) 5

Answer 1

Dear Student ,
The magnetic energy of the solenoid is :
$E=\frac{1}{2}L{I}^2=\frac{1}{2}\times 2\times 1^2=1J$
Regards