A plane electromagnetic wave of wavelength $\lambda $ has an intensity $I.$ It is propagating along the positive $Y-$ direction. The allowed expressions for the electric and magnetic fields are given by
A plane electromagnetic wave of wavelength $\lambda $ has an intensity $I.$ It is propagating along the positive $Y-$ direction. The allowed expressions for the electric and magnetic fields are given by
- [JEE MAIN 2018]
- A
$\vec E\, = \,\sqrt {\frac{I}{{{\varepsilon _0}C}}} \cos \left[ {\frac{{2\pi }}{\lambda }(y - ct)} \right]\,\hat i\,;\,\vec B\, = \,\frac{1}{c}E\hat k$
- B
$\vec E\, = \,\sqrt {\frac{I}{{{\varepsilon _0}C}}} \cos \left[ {\frac{{2\pi }}{\lambda }(y - ct)} \right]\,\hat k\,;\,\vec B\, = - \,\frac{1}{c}E\hat i$
- C
$\vec E\, = \,\sqrt {\frac{{2I}}{{{\varepsilon _0}C}}} \cos \left[ {\frac{{2\pi }}{\lambda }(y - ct)} \right]\,\hat k\,;\,\vec B\, = + \frac{1}{c}E\hat i$
- D
$\vec E\, = \,\sqrt {\frac{{2I}}{{{\varepsilon _0}C}}} \cos \left[ {\frac{{2\pi }}{\lambda }(y + ct)} \right]\,\hat k\,;\,\vec B\, = \frac{1}{c}E\hat i$
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