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In a plane electromagnetic wave electric field varies with time having an amplitude 1 Vm−1 . The frequency of wave is 0.5 × 1015 Hz. The wave is propagation along X-axis. What is the average energy density of magnetic field? |
1.1 × 10−12J m−3 2.2 × 10−12J m−3 3.3 × 10−12J m−3 4.4 × 10−12J m−3 |
2.2 × 10−12J m−3 |
In an electromagnetic wave, the average energy density of magnetic field $\mu_B$ = average energy density of electric filed $v_E =\frac{1}{4}ε_0E^2_0$ $=\frac{1}{4}×(8.85×10^{-12})×1^2$ $=2.21 × 10^{-12} Jm^{-3}$ |
