First slide

Introduction-Electromagnetic waves

Question

In a plane electromagnetic wave the electric field oscillates sinusoidally at a frequency $3 \times 10^{10} H z$ and amplitude 50 V/m. What is the amplitude of the oscillating magnetic fields?

Easy

A

$1.67 \times 10^{- 7} T$
B

$0.67 \times 10^{- 2} T$
C

$1.67 \times 10^{- 2} T$
D

$0.67 \times 10^{- 5} T$

Solution

Amplitude of oscillating magnetic field is $B_{o} = \frac{E_{o}}{C}$
$B_{o} = \frac{50}{3 \times 10^{8}}$
$B_{o} = 1.67 \times 10^{- 7} T$

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