Question

For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric (U_e) and magnetic (U_m) fields is ______.

Options

• U_e ≠ U_m

• U_e = U_m

• U_e > U_m

• U_e < U_m

Answer 1

For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric (U_e) and magnetic (U_m) fields is U_e = U_m.

Explanation:

The average energy density due to electric field (U_e) and magnetic field (U_m) for an electromagnetic wave is the same.