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Physics Question on Electromagnetic waves

In a plane e.m. wave, magnetic field oscillates sinusoidally with frequency 1 GHz. If its amplitude is 16×10−816 \times 10^{-8} T then amplitude of electric field is

A

16×108Vm−116 \times 10^8 V m^{-1}

B

48 Vm−148\, V m^{-1}

C

4.8 Vm14.8\, V m^1

D

84 Vm−184\, V m^{-1}

Answer

48 Vm−148\, V m^{-1}

Explanation

Solution

E0=c×B0=(3×108)(16×10−8)=48 V m−1E_0=c \times B_0=(3\times 10^8)(16 \times 10^{-8})=48\,V\,m^{-1}