The energy per unit volume in an electromagnetic wave is: a. all in the magnetic field
b. mostly in the electric field
c. equally divided between the electric and magnetic fields
d. mostly in the magnetic field

E) all in the electric field

c.

Explanation:

Electromagnetic waves are waves that are generated when an electric field and a magnetic field vibrate together. They are usually created whenever an electric field collides with a magnetic field.

In more generic terms for an electric field, the energy per unit volume is given by:

Energy density =

For magnetic field:

Energy density =

∴

For the electromagnetic wave (u):

Total energy density is:

Due to the fact that the energy related with both fields is equivalent:

Then:

E = cB

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