Gce Model Questions Vol1 2023 Physics Question 23

Practice objective / multiple choice question 23 from the 2023 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2023 Physics Objective / Multiple Choice Hard Difficulty
Question 23 GCE_MODEL_QUESTIONS_VOL1 • 2023 • PHYSICS • objective

A circular coil of radius \(0.10\) m has \(200\) turns and rotates in a uniform magnetic field of magnitude \(0.5\) T. The axis of rotation is perpendicular to the field direction. The coil is connected to a \(10\) \(\Omega\) resistor. Starting from rest, the coil is given a constant angular acceleration of \(50\) rad s\(^{-2}\). Determine (a) the magnitude of the induced emf at the instant when the angular speed reaches \(100\) rad s\(^{-1}\), (b) the instantaneous current through the resistor at that instant, and (c) the rate at which electrical energy is being dissipated in the resistor at that instant.

Answer Options

A. (a) \(\mathcal{E} \approx 2.0\times10^{2}\) V (≈200 V). (b) \(I \approx 20.0\) A. (c) Power dissipated \(P \approx 4.0\times10^{3}\) W (≈4.0 kW).
B. (a) \(\mathcal{E} \approx 7.9\times10^{1}\) V (≈79 V). (b) \(I \approx 7.9\) A. (c) Power dissipated \(P \approx 6.3\times10^{2}\) W (≈630 W).
C. (a) \(\mathcal{E} \approx 3.16\times10^{2}\) V (≈316 V). (b) \(I \approx 31.6\) A. (c) Power dissipated \(P \approx 1.0\times10^{4}\) W (≈10 kW).
Correct Answer D. (a) \(\mathcal{E} \approx 1.58\times10^{2}\) V (≈158 V). (b) \(I \approx 15.8\) A. (c) Power dissipated \(P \approx 2.5\times10^{3}\) W (≈2.5 kW).
Correct Answer
D
Correct Option:
(a) \(\mathcal{E} \approx 1.58\times10^{2}\) V (≈158 V). (b) \(I \approx 15.8\) A. (c) Power dissipated \(P \approx 2.5\times10^{3}\) W (≈2.5 kW).

About This Question

This is Gce Model Questions Vol1 2023 Physics Question 23. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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