(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In a certain region of space, there is a uniform magnetic field B = 4.49 × 10−5 T, parallel to the x-axis, and a uniform electric field E = 10.2 V/m, parallel to the y-axis.

The permeability of free space is 4 pi ×10−7 N · m2.

At what rate does energy cross a square area, 0.65 cm on a side, that is perpendicular

to the z-axis?

Answer in units of W.

2. Relevant equations

I = EB / permeability

P = IA

3. The attempt at a solution

I = (10.2 V/m)(4.49 e-5)/ (4*pi*e-7)

=364.449 A

P=(364.449 A) (0.0065 m)

=2.36892 W

This answer is not right when I plug it into my online homework answers. :(

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# Homework Help: Rate of energy

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