Q154 / 160 · AP EAMCET 2022 (07 Jul Shift 2) · Physics

In a plane electromagnetic wave $U_E$ and $U_B$ are average energy densities of electric field and magnetic field respectively, then the correct option in the following is

  • A
    $U_E=\frac{U_B}{2}$
  • B
    $U_E=2 U_B$
  • Correct answer
    C
    $U_E=U_B$
  • D
    $U_E \neq U_B$

Solution

Energy of electromagnetic wave is equally shared between electric and magnetic fields, $U_E=U_B$. i.e, $\frac{1}{2} \varepsilon_0 E^2=\frac{1}{2 \mu_0} B^2$

Hence, the correct answer is option: 'C'.

Relevant Questions