Electromagnetic Waves · JEE Main previous year questions

2026 2 questions

1. Q432026 · 2 Apr 2026 · Shift 1

   An electromagnetic wave travelling in $x$-direction is described by field equation ${\mathrm{E}}_y=300\sin \omega \left(t-\frac{x}{\mathrm{c}}\right)$. If the electron is restricted to move in $y$-direction only with speed of $1.5\times 10^{6}m/s$ then ratio of maximum electric and magnetic forces acting on the electron is ____.

   1. A.200
   2. B.150
   3. C.400
   4. D.300
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   Answer: A

2. Q472026 · 21 Jan 2026 · Shift 2· Numerical answer

   An electromagnetic wave of frequency 100 MHz propagates through a medium of conductivity, $\sigma =10mho/m$. The ratio of maximum conduction current density to maximum displacement current density is ____. $\left[\text{Take }\frac{1}{4\pi {ϵ}_0}=9\times 10^9\mathrm{N}{\mathrm{m}}^2/{\mathrm{C}}^2\right]$

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   Answer: 1800