Question

The amplitude of the sinusoidally oscillating electric field of a plane wave is 60v /m. Then the amplitude of the magnetic field is

• A. $12\times {10}^{-7}T$
• B. $6\times {10}^{-7}T$
• C. $6\times {10}^{-8}T$
• D. $2\times {10}^{-7}T$

Answer 1

The correct option is D $2\times {10}^{-7}T$

$\text{Given}$ : Electric field = 60 v /m

C = 3$\times {10}^8$ m/s${}^2$

$\text{To find}$ : Magnetic field

$\text{Solution}$ :

We know, C = $\frac{E_o}{B_o}$

Therefore, $B_o$ = $\frac{E_o}{C}$ = $\frac{60}{3\times {10}^8}$

= 2$\times {10}^{-7}$ T

$\text{Hence D is the correct option.}$