First slide

Nature of electromagnetic wave

Question

In an apparatus, the electric field was found to oscillate with an amplitude of 18 V/m. The magnitude of the oscillating magnetic field will be

Easy

A

$4 \times 10^{- 6} T$
B

$6 \times 10^{- 8} T$
C

$9 \times 10^{- 9} T$
D

$11 \times 10^{- 11} T$

Solution

$c = \frac{E}{B} \Rightarrow B = \frac{E}{c} = \frac{18}{3 \times 10^{8}} = 6 \times 10^{- 8} T$

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