The electric field 'E' and magnetic field 'B' in electromagnetic waves are:
Correct answer: C. Perpendicular to each other
- A. Parallel to each other
- B. Inclined at an angle of 45o
- C. Perpendicular to each other
- D. Opposite to each other
Explanation
The electric and magnetic fields (E and B) are in phase, and they are perpendicular to one another and the direction of propagation. For clarity, the waves are shown only along one direction, but they propagate out in other directions too.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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