Igcse Model Questions Vol1 2021 Physics Question 4

Practice objective / multiple choice question 4 from the 2021 Igcse Model Questions Vol1 Physics examination.

Igcse Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 4 IGCSE_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A rectangular coil has 30 turns, each side \(0.10\ \text{m}\). It rotates at \(50\) revolutions per second in a uniform magnetic field of \(0.20\ \text{T}\), the axis of rotation being perpendicular to the field. (a) Find the maximum emf induced in the coil. (b) If the coil is connected to a resistor of \(10\ \Omega\), calculate the peak current. (c) Determine the average electrical power dissipated in the resistor. (d) If the motor driving the coil supplies a mechanical power of \(20\ \text{W}\), calculate the efficiency of the system.

Answer Options

A. Maximum emf ≈ 20.0 V; peak current ≈ 2.00 A; average power ≈ 20.0 W; efficiency ≈ 100 %
Correct Answer B. Maximum emf ≈ 18.9 V; peak current ≈ 1.89 A; average power ≈ 17.8 W; efficiency ≈ 89 %
C. Maximum emf ≈ 15.0 V; peak current ≈ 1.50 A; average power ≈ 13.5 W; efficiency ≈ 68 %
D. Maximum emf ≈ 18.9 V; peak current ≈ 1.00 A; average power ≈ 10.0 W; efficiency ≈ 50 %
Correct Answer
B
Correct Option:
Maximum emf ≈ 18.9 V; peak current ≈ 1.89 A; average power ≈ 17.8 W; efficiency ≈ 89 %

About This Question

This is Igcse Model Questions Vol1 2021 Physics Question 4. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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