Neco Model Questions Vol1 2021 Physics Question 48

Practice objective / multiple choice question 48 from the 2021 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 48 NECO_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A rectangular coil of 50 turns, each side \(0.20\,\text{m}\), rotates in a uniform magnetic field of \(0.50\,\text{T}\). Its angular displacement is given by \(\theta(t)=100t+20t^{2}\) (with \(t\) in seconds).\ (a) Find the instantaneous emf at \(t=0.05\,\text{s}\).\ (b) Determine the first time after \(t=0\) when the induced emf becomes zero.

Answer Options

A. (a) \\(96.4\\) V (magnitude 96.4 V); (b) \\(0.040\\) s
B. (a) \\(-80.2\\) V (magnitude 80.2 V); (b) \\(0.025\\) s
Correct Answer C. (a) \(-96.4\) V (magnitude 96.4 V); (b) \(0.031\) s
D. (a) \\(-110.0\\) V (magnitude 110.0 V); (b) \\(0.015\\) s
Correct Answer
C
Correct Option:
(a) \(-96.4\) V (magnitude 96.4 V); (b) \(0.031\) s

About This Question

This is Neco Model Questions Vol1 2021 Physics Question 48. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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