At high frequency, the current through a capacitor of an alternating current circuit will be
Correct answer: B. Large
- A. Zero
- B. Large
- C. Small
- D. Varying unpredictably
Explanation
In an alternating current circuit, the current through a capacitor increases with frequency because the capacitive reactance (which opposes the flow of AC) decreases. Hence, at high frequencies, the reactance is low, allowing a large current to pass through. Option B is correct because the current becomes large as frequency increases. Option A is incorrect because the current is not zero; it's large. Option C is incorrect since the current is not small, and Option D is incorrect because the behavior is predictable with decreasing reactance.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Alternating Current
592 free Alternating Current MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More AC Through Resistor, Capacitor and Inductor questions
The combined effect of resistance and reactance in a circuit is known as
If the amount of current 'I' in a coil increases four times by keeping the inductance 'L' constant, then the energy flowing in the coil becomes
In an alternating current circuit, the current through a capacitor at a high frequency will be
An electrician is supposed to measure an AC voltage in a common household wiring. If his voltmetre measures 220 V in the wiring, then its peak value of the voltage will be
The basic circuit elements in an alternating current (AC) circuit which store energy in an electric and magnetic field areI. resistorII. inductorIII. capacitorIV. transistor
The root mean square (r.m.s.) current for this alternating current (AC) is