Choose the correct expression for the magnetic energy stored in a solenoid of length l and area A. (Here B is magnetic field)
1
\(\frac{1}{2 \mu_0 } BA^2 l\)
2
\(\frac{1}{2 \mu_0 } B^2A l\)
3
\(\frac{1}{2 \mu_0 } BA l^2\)
4
\(\frac{1}{2 \mu_0 } BAl\)