in AC through capacitor circuit the v and q are as
Correct answer: A. V leads q
- A. V leads q
- B. V legs q
- C. V and q are in phase
- D. none of these
Explanation
In an AC circuit with a capacitor, the relationship between voltage (V) and charge (Q) is as follows:a. Voltage (V) leads charge (Q) by 90 degrees.This is because in a capacitor, the current (I) leads the voltage (V) by 90 degrees, and the current (I) is directly proportional to the rate of change of charge (Q). Mathematically, this can be represented as:I = C * (dV/dt)Where C is the capacitance, dV/dt is the rate of change of voltage with respect to time, and I is the current.Since current (I) is in phase with the rate of change of charge (dQ/dt), it means that the charge (Q) lags the current (I) by 90 degrees. As a result, voltage (V) leads charge (Q) by 90 degrees
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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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