Neco Model Questions Vol1 2021 Physics Question 21

Practice objective / multiple choice question 21 from the 2021 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 21 NECO_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A rectangular coil of 50 turns has dimensions 0.20 m by 0.10 m and is placed in a uniform magnetic field of 0.5 T perpendicular to the plane of the coil. The coil is pulled out of the field so that the area within the field decreases uniformly to zero in 0.40 s. The coil has an internal resistance of 2 Ω and is connected across an external resistor of 10 Ω. (a) Determine the average induced emf in the coil during the motion. (b) Find the current flowing in the circuit and the power dissipated in the external resistor. (c) Calculate the total electrical energy converted into heat and the mechanical work that must be done against the magnetic drag.

Answer Options

Correct Answer A. Average emf = 1.25 V; I = 0.104 A; Power in external resistor = 0.109 W (energy 0.043 J); Total electrical energy = 0.052 J, which equals the mechanical work required.
B. Average emf = 0.90 V; I = 0.075 A; Power in external resistor = 0.056 W (energy 0.022 J); Total electrical energy = 0.030 J, which equals the mechanical work required.
C. Average emf = 1.50 V; I = 0.125 A; Power in external resistor = 0.156 W (energy 0.062 J); Total electrical energy = 0.070 J, which equals the mechanical work required.
D. Average emf = 1.00 V; I = 0.083 A; Power in external resistor = 0.083 W (energy 0.033 J); Total electrical energy = 0.040 J, which equals the mechanical work required.
Correct Answer
A
Correct Option:
Average emf = 1.25 V; I = 0.104 A; Power in external resistor = 0.109 W (energy 0.043 J); Total electrical energy = 0.052 J, which equals the mechanical work required.

About This Question

This is Neco Model Questions Vol1 2021 Physics Question 21. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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