Question 106: EM waves

Question

A light beam is described by $$E = 800\sin \omega \left( {t - {x \over c}} ight)$$. An electron is allowed to move normal to the propagation of light beam with a speed of 3 $$	imes$$ 10
7
ms
$$-$$1
. What is the maximum magnetic force exerted on the electron?

Accepted Answer

$${{{E_0}} \over C} = {B_0}$$
$${F_{\max }} = e{B_0}V$$
$$ = 1.6 	imes {10^{ - 19}} 	imes {{800} \over {3 	imes {{10}^8}}} 	imes 3 	imes {10^7}$$
$$ = 12.8 	imes {10^{ - 18}}$$ N

Answer

1.28 $$	imes$$ 10
$$-$$18
N

Answer

1.28 $$	imes$$ 10
$$-$$21
N

Answer

12.8 $$	imes$$ 10
$$-$$17
N

Answer

12.8 $$	imes$$ 10
$$-$$18
N

EM waves

A light beam is described by $E = 800\sin \omega \left( {t - {x \over c}} \right). An electron is allowed to move normal to the propagation of light beam with a speed of 3 \times 10 7 ms -$1 . What is the maximum magnetic force exerted on the electron?

Choose the correct answer: