An electric bulb is rated as 200 W. What will be the peak magnetic field at 4 m distance produced by the radiations coming from this bulb? Consider this bulb as a point source with 3.5% efficiency.

Options

A. `1.19 xx 10^(-8) T`
B. `1.71 xx 10^(-8) T`
C. `0.84 xx 10^(-8)` T
D. `3.36 xx 10^(-8)` T

Explanation

To solve the problem, we will follow these steps:

### Step 1: Calculate the Actual Power Output of the Bulb
The electric bulb is rated at 200 W, but it has an efficiency of 3.5%. We need to find the actual power output (P_actual) of the bulb.

\[ P_{\text{actual}} = \text{Efficiency} \times P_{\text{rated}} = 0.035 \times 200 \, \text{W} = 7 \, \text{W} \]
...