Neco Model Questions Vol1 2022 Physics Question 9

Practice objective / multiple choice question 9 from the 2022 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2022 Physics Objective / Multiple Choice Hard Difficulty
Question 9 NECO_MODEL_QUESTIONS_VOL1 • 2022 • PHYSICS • objective

A rectangular coil of \(N=50\) turns has dimensions \(0.10\) m by \(0.20\) m and rotates about its longer side in a uniform magnetic field \(B=0.5\) T. The plane of the coil is initially perpendicular to the field. (a) Find the angular speed \(\omega\) (in rad s⁻¹) required for the coil to produce a maximum induced emf of \(5\) V. (b) The coil has resistance \(R=2\) Ω and self‑inductance \(L=0.20\) H. Determine the average electrical power dissipated in the resistor and the torque that must be applied to keep the coil rotating at the constant speed found in part (a).

Answer Options

A. ω=15 rad\/s; average power≈5.6 W; torque≈0.56 N·m
Correct Answer B. ω=10 rad/s; average power≈3.13 W; torque≈0.313 N·m
C. ω=12 rad\/s; average power≈4.0 W; torque≈0.40 N·m
D. ω=8 rad\/s; average power≈2.5 W; torque≈0.25 N·m
Correct Answer
B
Correct Option:
ω=10 rad/s; average power≈3.13 W; torque≈0.313 N·m

About This Question

This is Neco Model Questions Vol1 2022 Physics Question 9. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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