TS EAMCET · Physics · Electromagnetic Waves
Let \(\mathbf{E}_0\) and \(\mathbf{B}_0\) denote the amplitude of electric and magnetic field of a plane electromagnetic wave in air. The magnitude of the average momentum transferred per unit area and per unit time to a totally absorbing surface is
- A \(\frac{1}{2} \varepsilon_0 E_0^2\)
- B \(\frac{1}{2} \mu_0 B_0\)
- C \(\varepsilon_0 E_0^2\)
- D \(2 \frac{B_0^2}{\mu_0}\)
Answer & Solution
Correct Answer
(A) \(\frac{1}{2} \varepsilon_0 E_0^2\)
Step-by-step Solution
Detailed explanation
Intensity of electromagnetic wave, \(I=\frac{1}{2} \varepsilon_0 E_0^2 c=\frac{1}{2} \frac{B_0^2 c}{\mu_0}\) where, \(B_0=\) electric field and \(c=\) speed of light. Now, momentum transfer per unit area per unit time, which is also called radiation pressure.…
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