TestUstad

A 35 Ω resistor and a 120 μF capacitor are connected in series to a 200 V, 60 Hz AC supply. The current is:

Correct answer: B. 4.5 A

  • A. 3.5 A
  • B. 4.5 A
  • C. 5.5 A
  • D. 6.5 A

Explanation

Xc = 1/(2π × 60 × 120 × 10⁻⁶) ≈ 22.1 Ω. Impedance Z = √(35² + 22.1²) ≈ √(1225 + 488.41) ≈ 41.4 Ω. Current I = 200/41.4 ≈ 4.83 A, closest to 4.5 A.

Written and checked by , contributorLast updated
Report an error

The more specific you are, the faster it gets fixed. A source beats an opinion.

Prefer email? [email protected]

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.

Practise Alternating Current

592 free Alternating Current MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.

Start a free Alternating Current testAll Alternating Current MCQs

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.

Lecturer Physics Test Physics80 MCQsSubject Specialist Physics Test Physics80 MCQsNET Physics60 MCQsNUMS Physics40 MCQsDUHS Physics36 MCQsETEA MDCAT Physics36 MCQsKMU Physics36 MCQsMDCAT Physics36 MCQsECAT Physics30 MCQsETEA Engineering Admission Test Physics30 MCQsGIKI Physics30 MCQsNED Physics30 MCQsPIEAS Physics30 MCQsPMD Physics25 MCQsBSN Entry Test Physics20 MCQsPAF Airman Physics15 MCQs

More Alternating Current questions

In an AC circuit with a 12 Ω resistor and a 30 mH inductor in series at 50 Hz, the power factor is:

For a sinusoidal altrnating current, if the peak current is I ,the RMS current (I ) is:

An LCR series circuit with R = 10 Ω, L = 0.08 H, and C = 60 μF is connected to a 110 V, 50 Hz supply. The impedance is:

An LCR series circuit with R = 20 Ω, L = 0.25 H, and C = 50 μF is at resonance. If connected to a 150 V supply, the current is:

A 10 Ω resistor and a 40 μF capacitor are connected in parallel to a 110 V, 50 Hz AC supply. The total current is:

An AC circuit has a 10 Ω resistor and a 20 mH inductor connected in series to a 50 V (peak) source at 60 Hz. What is the impedance of the circuit?