Question

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

• A. $\frac{E}{2}$
• B. 2E
• C. $\frac{E}{\sqrt{2}}$
• D. $\sqrt{2}E$

Answer 1

Answer: (A)

$\frac{E}{2}$

The intensity of the field created by the radiations coming from the bulb is directly proportional to the power of the radiations.

Since power becomes half the intensity also becomes half as the energy consumed is reduced.

Therefore, the electric field intensity of the radiation will be$\frac{E}{2}$.