Physics · PYQ NEET UG 2026

An electromagnetic wave travelling in a lossless dielectric medium having a dielectric constant, ( \epsilon_r = 9 ), has the electric field, ( E_x = E_0 \sin(kz - 2\pi \times 10^6 t) \text{ Vm}^{-1} ) where ( E_0 ) is the amplitude and ( k ) is the wave vector. Among the following options, the incorrect choice is :

1. A
   The speed of the electromagnetic wave inside the medium is ( 10^8 \text{ ms}^{-1} )
2. B
   The wavelength of the electromagnetic wave inside the medium is ( 300 \text{ m} )
3. C
   The magnetic field is given by the relation ( B_y = \frac{B_0}{\nu} \sin(kz - 2\pi \times 10^6 t) ) where ( \nu ) is the speed of the electromagnetic wave inside the medium
4. D
   The direction of propagation of the wave is along ( +z )