Gce Model Questions Vol1 2017 Physics Question 46

Practice objective / multiple choice question 46 from the 2017 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2017 Physics Objective / Multiple Choice Hard Difficulty
Question 46 GCE_MODEL_QUESTIONS_VOL1 • 2017 • PHYSICS • objective

A rectangular coil of 30 turns, each side 0.10 m by 0.20 m, rotates at a constant angular speed \(\omega\) in a uniform magnetic field \(B = 0.5\,\text{T}\). The coil has an internal resistance of \(5\,\Omega\). When a resistor of \(20\,\Omega\) is connected across the coil, the average power dissipated in the resistor is measured to be \(0.8\,\text{W}\). Determine (a) the angular speed \(\omega\) in \(\text{rad s}^{-1}\), (b) the resistance that should be connected to obtain maximum average power, and (c) the maximum average power delivered to the load.

Answer Options

Correct Answer A. ω = 4.42 rad s⁻¹, R = 5 Ω, P_max = 1.25 W
B. ω = 4.42 rad s⁻¹, R = 10 Ω, P_max = 1.25 W
C. ω = 4.42 rad s⁻¹, R = 5 Ω, P_max = 0.80 W
D. ω = 5.00 rad s⁻¹, R = 5 Ω, P_max = 1.25 W
Correct Answer
A
Correct Option:
ω = 4.42 rad s⁻¹, R = 5 Ω, P_max = 1.25 W

About This Question

This is Gce Model Questions Vol1 2017 Physics Question 46. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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