Question

A beam of light travelling along X-axis is described by the electric field E_y = 900 sin ω(t - x/c). The ratio of electric force to magnetic force on a charge q moving along Y-axis with a speed of 3 × 10⁷ ms^-1 will be : [Given speed of light = 3 × 10⁸ ms^-1]

विकल्प

• 1 : 1

• 1 : 10

• 10 : 1

• 1 : 2

Answer 1

10 : 1

Explanation:

We have

`"F"_"e"/"F"_"B"`

= `("qE"_0)/("qVB"_0)`

= `"E"_0/"VB"_0`

= `"c"/"V"`

= `(3xx10^8)/(3xx10^7)`

= `10/1`