In an electromagnetic wave,the electric field $\vec{E}$ and the magnetic field $\vec{B}$ oscillate in the region near the source as:
- AParallel to each other and in the same phase
- BPerpendicular to each other and in the same phase
- CParallel to each other and with a phase difference of $\pi / 2$
- DPerpendicular to each other and with a phase difference of $\pi / 2$
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