The sodium lamp used in a physics laboratory gives out light uniformly. Suppose that the lamp uses 60 W. Calculate the magnitude of electric field.

To calculate the magnitude of the electric field produced by the sodium lamp, we can use the concept of radiant flux and the relationship between electric field and radiant flux.

Given that the lamp uses 60 W of power, this represents the radiant flux emitted by the lamp. Radiant flux is the amount of radiant energy emitted, transmitted, or received per unit time, and it is measured in watts (W).

The relationship between radiant flux and electric field can be expressed using the formula:

\[ P = \frac{1}{2} \varepsilon_0 c E^2 A \]

where:
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