Igcse Model Questions Vol1 2021 Physics Question 21

Practice objective / multiple choice question 21 from the 2021 Igcse Model Questions Vol1 Physics examination.

Igcse Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 21 IGCSE_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A coil of 200 turns and area \(0.02\ \text{m}^2\) rotates uniformly in a uniform magnetic field of flux density \(0.5\ \text{T}\) at a rate of 50 revolutions per second. The coil has an internal resistance of \(5\ \Omega\) and is connected to an external resistor \(R\).\n\n(a) Determine the value of \(R\) that makes the average power dissipated in the external resistor a maximum.\n\n(b) Calculate that maximum average power (in watts, give your answer to three significant figures).

Answer Options

A. R = 10 \ \Omega; maximum average power \approx 4.93 \times 10^{3} \ \text{W}
B. R = 7.5 \ \Omega; maximum average power \approx 7.42 \times 10^{3} \ \text{W}
Correct Answer C. R = 5 \ \Omega; maximum average power \approx 9.87 \times 10^{3} \ \text{W}
D. R = 2.5 \ \Omega; maximum average power \approx 5.00 \times 10^{3} \ \text{W}
Correct Answer
C
Correct Option:
R = 5 \ \Omega; maximum average power \approx 9.87 \times 10^{3} \ \text{W}

About This Question

This is Igcse Model Questions Vol1 2021 Physics Question 21. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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