There is one small bulb of 500 watt .Assume its effiency to be 20 % caculate amplitude of electric field produced by it a distance of 1 m from the bulb .

Explanation

To solve the problem of calculating the amplitude of the electric field produced by a 500-watt bulb with 20% efficiency at a distance of 1 meter, we can follow these steps:

### Step-by-Step Solution:

1. **Calculate the Effective Power Output:**
The bulb has a power rating of 500 watts and operates at 20% efficiency. Therefore, the effective power output (P) can be calculated as:
\[
P = \text{Efficiency} \times \text{Rated Power} = 0.20 \times 500 \, \text{W} = 100 \, \text{W}
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