# Propagation

### Explanation of question 4

The electric and magnetic fields associated with a transmitted signal will oscillate

1. in phase with each other
2. 45° out of phase with each other
3. 90° out of phase with each other
4. in anti-phase with each other

The answer is :- 1 E and H oscillate in phase with each other, i.e. as E changes 180o, so does H.

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