"The way the field varies is quite complex," he said.

The second term is the extra potential energy when the field varies from point to point.

This field varies in strength with the level of current sent through the solenoid.

We have found that the electric field varies as 1/R.

The values taken by depend on the mathematical space over which the random field varies.

These fields may vary especially for variations of the game.

If the electric field does vary, at what rate?

His field of study at Princeton varied a good deal.

The above discussion assumes that the magnetic field is not varying in time.

Both the magnetic and electric fields at your location would vary with time.