Neco Model Questions Vol1 2019 Physics Question 10

Practice objective / multiple choice question 10 from the 2019 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2019 Physics Objective / Multiple Choice Hard Difficulty
Question 10 NECO_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • objective

A rectangular coil of 50 turns, each side 0.20 m by 0.10 m, rotates at a constant angular speed \(\omega\) in a uniform magnetic field \(B = 0.5\) T. The axis of rotation is perpendicular to the field and passes through the centre of the coil. The coil is connected to a resistor of \(R = 10\) Ω. (a) At the instant when the plane of the coil makes an angle of \(30^{\circ}\) with the magnetic field, determine the magnitude of the induced emf, (b) the instantaneous current, and (c) the rate at which electrical energy is being dissipated in the resistor. (d) If the maximum induced emf is 5 V, find the angular speed \(\omega\).

Answer Options

A. ω = 10 rad s⁻¹; emf = 2.0 V; I = 0.20 A; power = 0.40 W
B. ω = 9 rad s⁻¹; emf = 2.25 V; I = 0.225 A; power = 0.506 W
Correct Answer C. ω = 10 rad s⁻¹; emf = 2.5 V; I = 0.25 A; power = 0.625 W
D. ω = 11 rad s⁻¹; emf = 2.75 V; I = 0.275 A; power = 0.756 W
Correct Answer
C
Correct Option:
ω = 10 rad s⁻¹; emf = 2.5 V; I = 0.25 A; power = 0.625 W

About This Question

This is Neco Model Questions Vol1 2019 Physics Question 10. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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