Source of an electromagnetic wave is:
Correct answer: C. A charge moving in a circular orbit
- A. A charge moving with constant velocity
- B. A charge at rest
- C. A charge moving in a circular orbit
- D. Charges cannot produce an EM wave
Explanation
Charge moving in a circular orbit will have a variable acceleration as well as variable direction producing magnetic as well as electric field.
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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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