TS EAMCET · Physics · Electromagnetic Waves
A plane electromagnetic wave of electric and magnetic fields \(E_0\) and \(B_0\) respectively incidents on a surface. If the total energy transferred to the surface in a time of ' \(t\) ' is ' \(U\), then the magnitude of the total momentum delivered to the surface for complete absorption is
- A \(\frac{U E_0}{B_0}\)
- B \(\frac{U B_0}{E_0}\)
- C \(\frac{U}{E_0 B_0}\)
- D \(\frac{U B_0}{E_0^2}\)
Answer & Solution
Correct Answer
(B) \(\frac{U B_0}{E_0}\)
Step-by-step Solution
Detailed explanation
If electromagnetic wave in incident on a completely absorbing surface then momentum delivered, \(\mathrm{p}=\frac{\mathrm{U}}{\mathrm{C}}\) \(\begin{aligned} & \text { But } c=\frac{E_0}{B_0} \\ & \therefore p=\frac{U_0}{E_0} \end{aligned}\)
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