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The Speed of EM Waves

In an apparat...

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

A

4 X 10^-6T

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B

6 X 10^-8T

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C

9 X 10^-9T

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D

11 X 10^-11T

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Solution

The correct option is B 6 X 10^-8T
$c = \frac{E}{B} \Rightarrow B = \frac{E}{c} = \frac{18}{3 \times 10^{8}} = 6 \times 10^{- 8} T .$

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