Question

A plane electromagnetic wave travels in free space along x-axis. At a particular point in space, the electric field along y-axis is $9.3V/m$. The magnetic induction (B) along z-axis is

• A. $3.1\times {10}^{-8}T$
• B. $3\times {10}^{-5}T$
• C. $3\times {10}^{-6}T$
• D. $9.3\times {10}^{-6}T$

Answer 1

The correct option is A $3.1\times {10}^{-8}T$

Velocity of light, $C=\frac{E}{B}⟹B=\frac{E}{C}=\frac{9.3}{3\times {10}^8}=3.1\times {10}^{-8}T$