- #1

A90

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## Homework Statement

What is the approximate electric field strength of the electromagnetic waves radiated by a 100-W light bulb, measured 3.0m from the bulb?

## Homework Equations

$$\vec{E}=\frac{kq}{d^{2}}$$

$$P=\frac{2kq^{2}a^{2}}{3c^{3}}$$

## The Attempt at a Solution

I solved for ##q=\sqrt{\frac{3Pc^{3}}{2ka^{2}}}##, and then plugged that into the equation for electric field, and I have all the values I need to solve except for the acceleration, which I'm not sure how to find. I thought about using the second derivative of ##x(t)= x~sin(\omega~t)##, but I don't know what to use for ##x##, ##\omega## or ##t##.

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