Concepts Of Physics MCQ Edition [Volume 2]PhysicsAlternating Current
For an AC series circuit, the instantaneous current becomes zero at the moment the instantaneous voltage reaches its maximum value. The components connected to the source could be a
Options
- Apure resistor
- Bcombination of an inductor and a capacitor
- Cpure capacitor
- Dpure inductor
Correct answer
D. pure inductor
Step-by-step solution
Let the instantaneous voltage be V = V₀ ( t) . The voltage reaches its maximum value at t = 0 . Let the instantaneous current be I = I₀ ( t + ) , where is the phase difference between the voltage and the current. Given that at t = 0 , I = 0 . Substituting t = 0 in the current equation: I₀ ( ) = 0 ( ) = 0 = 2 The phase difference between the voltage and the current is 2 . This means the circuit is purely reactive and has zero resistance ( R = 0 ). This condition is satisfied by: 1. A pure capacitor (current leads vo