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# A sinusoidal electromagnetic plane wave travels through the empty space in $x$ - direction. The electric wave is polarized in the $y$ - direction frequency of waves is $1.5\: GHz$. At a certain point $P$ in space, the oscillating $E_y$ attains a maximum magnitude $E_o = 6.3 \: mV/m$  The maximum magnitude $B_o$ of the magnetic field at the point is

$\begin {array} {1 1} (a)\;2.1 \times 10^{-7}T & \quad (b)\;0.14 \times 10^{-7}T \\ (c)\;1.4 \times 10^{-5}T & \quad (d)\; 2.1 \times 10^{-5}T \end {array}$

$B_o = \large\frac{E_o}{c}$$= \large\frac{6.3 \times 10^{-3}}{ (3 \times 10^8 )}$$ = 2.1 \times 10^{-5}T$
Ans : (d)