A solenoid, 90.0 cm long, has a cross-sectional area of 20.0 cm2. It has 900 turns of wire and carries a current of 5.0 A. The total energy stored in the magnetic field of the solenoid, neglecting end effects, is (nearly)
1
1.21 × 10−4 J
2
2.32 × 10−3 J
3
2.83 × 10−2 J
4
0.53 J