Question

1. What is the maximum strength of the magnetic field (T) in an electromagnetic wave that has a maximum electric field strength of 1.00 x 10³ V/m?

1. 3.33 x 10^-6
2. 1.01 x 10^-6
3. 5.98 x 10^-5
4. 9.00 x 10^-4

Answer 1

a. 3.33 x 10 ^-6

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Maximum electric and magnetic field strength are related by :

$B_{max} = \frac{E_{max}}{c}$

Where c is speed of light = 3 x 10 ⁸ m/s

Thus

$B_{max} = \frac{10^3}{3\times10^8} T = 3.33\times10^{-6}\;T$