# Differentiating electromagnetic field

For question 3, i don't know ho to differentiate the electromagnetic field. Can someone help me?

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correction

It's question 2

HallsofIvy
Homework Helper
If F(x,y,z,t) the "total derivative of F is:
$$\frac{\partial F}{\partial x}dx+\frac{\partial F}{\partial y}dy+\frac{\partial F}{\partial z}dz+\frac{\partial F}{\partial t}dt$$

help with #2 not #3

I put the wrong question number down. It's #2 that I need help with. Can someone help?

HallsofIvy
In any case, I have already given the general formula for "total differential". You might also want to know that, for a vector valued function E, $$\frac{\partial(E.E)}{\partial x}= 2E.\frac{\partial E}{\partial x}$$. That should be all you need.