The velocity of an oscillating charge as it moves to and fro along a wire is always_____________?
Correct answer: C. changing
- A. constant
- B. zero
- C. changing
- D. infinite
Explanation
For an oscillating charge, velocity changes continuously in magnitude and reverses direction as the charge moves to and fro, so it is not constant. At the extreme positions its instantaneous velocity is zero, and between them it changes sign. The likely mistake is choosing zero because the charge stops momentarily at the ends, but it is not zero throughout the motion.
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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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