# Homework Help: Total Power Radiated

1. Nov 16, 2011

### PassThePi

What is the total power radiated by an isotropic source in free space is |E| = 1mV/m at a distance of 10km?

Relevant Eqns:

Is this correct? I feel like it can't be that simple.

Last edited: Nov 16, 2011
2. Nov 16, 2011

### yungman

Your 1mV/m is measured at a point 10Km away, to calculate the total power of the isotropic source( E is equal in magnitude at any point on the sphere), you need to have some sort of integration of the whole surface of radius of 10Km.

I don't understand your formula at all!!!

Last edited: Nov 16, 2011
3. Nov 16, 2011

### PassThePi

Oh I think I see...