Neco Model Questions Vol1 2018 Physics Question 44

Practice objective / multiple choice question 44 from the 2018 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2018 Physics Objective / Multiple Choice Hard Difficulty
Question 44 NECO_MODEL_QUESTIONS_VOL1 • 2018 • PHYSICS • objective

A rectangular coil of \(N=200\) turns and area \(A=0.01\;\text{m}^2\) rotates uniformly in a uniform magnetic field of magnitude \(B=0.5\;\text{T}\) at a frequency of \(50\;\text{Hz}\). The coil terminals are connected across a resistor of resistance \(R=10\;\Omega\). (a) Find the maximum induced emf. (b) Determine the rms current in the circuit. (c) Calculate the mechanical power that must be supplied to keep the coil rotating at constant speed (neglecting losses).

Answer Options

A. Maximum emf = 3.5×10^2 V; I_rms ≈ 25 A; Mechanical power ≈ 5.5 kW
B. Maximum emf = 2.5×10^2 V; I_rms ≈ 20 A; Mechanical power ≈ 4.0 kW
Correct Answer C. Maximum emf = 3.14×10^2 V; I_rms ≈ 22.2 A; Mechanical power ≈ 4.9 kW
D. Maximum emf = 2.8×10^2 V; I_rms ≈ 18 A; Mechanical power ≈ 3.2 kW
Correct Answer
C
Correct Option:
Maximum emf = 3.14×10^2 V; I_rms ≈ 22.2 A; Mechanical power ≈ 4.9 kW

About This Question

This is Neco Model Questions Vol1 2018 Physics Question 44. It is one of the objective questions from the 2018 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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