The magnetic field within an air-cored solenoid is 0.8 T. If the solenoid is 40 cm long and 2 cm in diameter, the energy stored in its magnetic field is
A. 32 J
B. 3.2 J
C. 6.4 kJ
D. 64 kJ
Answer:A
The magnetic field within an air-cored solenoid is 0.8 T. If the solenoid is 40 cm long and 2 cm in diameter, the energy stored in its magnetic field is
A. 32 J B. 3.2 J C. 6.4 kJ D. 64 kJ