Neco Model Questions Vol1 2019 Physics Question 46

Practice objective / multiple choice question 46 from the 2019 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2019 Physics Objective / Multiple Choice Hard Difficulty
Question 46 NECO_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • objective

A rectangular coil of 50 turns has dimensions 0.20 m by 0.10 m and rotates at a constant speed in a uniform magnetic field of magnitude 0.5 T. The coil makes 120 revolutions per minute. Its own resistance is 2 Ω and it is connected to an external resistor of 10 Ω. (a) Determine the maximum induced emf in the coil. (b) Find the average power dissipated in the external resistor. (c) If the coil were rewound with 100 turns, keeping the resistance per turn unchanged, what value of external resistance (greater than the coil's internal resistance) would be required to keep the average power in the external resistor the same as in part (b)?

Answer Options

A. Maximum emf \(\approx 4.71\,\text{V}\); average power \(\approx 2.00\,\text{W}\); required external resistance \(\approx 30.0\,\Omega\).
B. Maximum emf \(\approx 7.85\,\text{V}\); average power \(\approx 1.00\,\text{W}\); required external resistance \(\approx 60.0\,\Omega\).
C. Maximum emf \(\approx 5.00\,\text{V}\); average power \(\approx 1.50\,\text{W}\); required external resistance \(\approx 40.0\,\Omega\).
Correct Answer D. Maximum emf \(\approx 6.28\,\text{V}\); average power \(\approx 1.37\,\text{W}\); required external resistance \(\approx 49.3\,\Omega\).
Correct Answer
D
Correct Option:
Maximum emf \(\approx 6.28\,\text{V}\); average power \(\approx 1.37\,\text{W}\); required external resistance \(\approx 49.3\,\Omega\).

About This Question

This is Neco Model Questions Vol1 2019 Physics Question 46. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

View More Neco Model Questions Vol1 2019 Physics Questions More Neco Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support