The average energy density of an electromagnetic wave of magnetic field 4π × 10-7 T is
A. 2π × 10-7 Jm-3
B. 4π × 10-7 Jm-3
C. 19.878 × 10-6 Jm-3
D. 6.626 × 10-7 Jm-3
Answer:A
The average energy density of an electromagnetic wave of magnetic field 4π × 10-7 T is
A. 2π × 10-7 Jm-3 B. 4π × 10-7 Jm-3 C. 19.878 × 10-6 Jm-3 D. 6.626 × 10-7 Jm-3