Neco Model Questions Vol1 2025 Physics Question 7

Practice objective / multiple choice question 7 from the 2025 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2025 Physics Objective / Multiple Choice Hard Difficulty
Question 7 NECO_MODEL_QUESTIONS_VOL1 • 2025 • PHYSICS • objective

A rectangular coil of \(N=200\) turns and area \(A=0.01\ \text{m}^{2}\) rotates uniformly in a uniform magnetic field. The coil makes 5 revolutions in 2 s and the maximum induced emf observed is \(0.5\ \text{V}\). (a) Determine the magnetic field strength \(B\). (b) If the coil is connected to a resistor of \(R=10\ \Omega\), calculate the average power dissipated in the resistor over one full rotation.

Answer Options

A. B = \frac{1}{20\pi}\ \text{T} \;(\approx0.0159\ \text{T});\; P_{\rm avg}=0.025\ \text{W}
B. B = \frac{1}{10\pi}\ \text{T} \;(\approx0.0318\ \text{T});\; P_{\rm avg}=0.025\ \text{W}
Correct Answer C. B = \frac{1}{20\pi}\ \text{T} \;(\approx0.0159\ \text{T});\; P_{\rm avg}=0.0125\ \text{W}
D. B = \frac{1}{40\pi}\ \text{T} \;(\approx0.00796\ \text{T});\; P_{\rm avg}=0.00625\ \text{W}
Correct Answer
C
Correct Option:
B = \frac{1}{20\pi}\ \text{T} \;(\approx0.0159\ \text{T});\; P_{\rm avg}=0.0125\ \text{W}

About This Question

This is Neco Model Questions Vol1 2025 Physics Question 7. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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