Waec Model Questions Vol1 2021 Physics Question 37

Practice objective / multiple choice question 37 from the 2021 Waec Model Questions Vol1 Physics examination.

Waec Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 37 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A rectangular coil of dimensions 0.20 m by 0.30 m has 200 turns and rotates uniformly in a uniform magnetic field of magnitude 0.50 T. The coil rotates at a frequency of 60 Hz and is connected to a resistor of 10 Ω. At t = 0 the plane of the coil is perpendicular to the field. (a) Find the maximum emf induced in the coil. (b) Determine the average power dissipated in the resistor over one complete rotation. (c) If the resistor is replaced by another resistor so that the average power dissipated doubles, find the value of the new resistance.

Answer Options

A. (a) 720π V ≈ 2.26×10³ V; (b) 5.12×10⁵ W; (c) 2.5 Ω
B. (a) 360π V ≈ 1.13×10³ V; (b) 1.28×10⁵ W; (c) 20 Ω
Correct Answer C. (a) 720π V ≈ 2.26×10³ V; (b) 2.56×10⁵ W; (c) 5 Ω
D. (a) 1440π V ≈ 4.52×10³ V; (b) 2.56×10⁵ W; (c) 2 Ω
Correct Answer
C
Correct Option:
(a) 720π V ≈ 2.26×10³ V; (b) 2.56×10⁵ W; (c) 5 Ω

About This Question

This is Waec Model Questions Vol1 2021 Physics Question 37. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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