PhysicsJEE Main 22 Jan 2026, Shift 1·Q22·Numerical·Easy–moderate

Electromagnetic Waves · EM waves

The electric field of a plane electromagnetic wave, travelling in an unknown non-magnetic medium is given by,

E_y = 20\sin\left(3\times10^{6}x - 4.5\times10^{14}t\right)\ \mathrm{V/m}

(where x, t and other values have S.I. units). The dielectric constant of the medium is . (speed of light in free space is

3\times10^{8}

m/s)

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