Electrical resonance is observed in_______________?
Correct answer: A. Radio
- A. Radio
- B. Microwave oven
- C. Both in radio and microwave oven
- D. Neither in radio nor in a microwave oven
Explanation
A radio uses an LC tuning circuit in which inductive and capacitive reactances can become equal, producing electrical resonance and selecting a station's frequency. A microwave oven uses electromagnetic resonance in its cavity, but this is not normally called the electrical resonance tested by this question. Students may choose c by applying the broad idea of resonance to the oven rather than the usual radio-tuning context.
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About AC Through Resistor, Capacitor and Inductor
Alternating current through a resistor, capacitor and inductor involves phase relationships between voltage and current, reactance, impedance and energy transfer. A resistor keeps voltage and current in phase, while a capacitor and inductor produce opposite phase shifts, a distinction used in circuit diagrams and numerical calculations.
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