In a plane electromagnetic wave,$U_E$ and $U_B$ are the average energy densities of the electric field and magnetic field,respectively. Then,which of the following is the correct option?
- A$U_E = \frac{U_B}{2}$
- B$U_E = 2 U_B$
- C$U_E = U_B$
- D$U_E \neq U_B$
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