Question

The electric field intensity produced by the radiations coming from 100 W bulb at 3 m distance is E. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is:

Options

• `E/2`

• 2E

• `E/sqrt2`

• `sqrt2E`

Answer 1

E/2

Explanation -

Electric field intensity, E = `("P"("Power"))/("A"("area"))`

Distance is same,

∴ `E^'/E = P^'/P` or `E^'/E = 50/100`

∴ `E^' = E/2`