Question 157: EM waves

Question

The magnetic field in a travelling electromagnetic wave has a peak value of $$20$$ $$n$$$$T$$. The peak value of electric field strength is :

Accepted Answer

From question,
$${B_0} = 20nT = 20 	imes {10^{ - 9}}T$$
( as velocity of light in vacuum $$C = 3 	imes {10^8}\,\,m{s^{ - 1}}$$ )
$${\overrightarrow E _0} = {\overrightarrow B _0} 	imes \overrightarrow C $$
$$\left| {{{\overrightarrow E }_0}} ight| = \left| {\overrightarrow B } ight|.\left| {\overrightarrow C } ight| = 20 	imes {10^{ - 9}} 	imes 3 	imes {10^8}$$
$$ = 6\,\,V/m.$$

Answer

$$3V/m$$

Answer

$$6V/m$$

Answer

$$9V/m$$

Answer

$$12V/m$$

EM waves

The magnetic field in a travelling electromagnetic wave has a peak value of $20 nT$. The peak value of electric field strength is :

Choose the correct answer: