waec model questions vol1 2019 physics
Objective • Question 23
Question 23
WAEC_MODEL_QUESTIONS_VOL1
•
2019
A rectangular coil of \(N=200\) turns and area \(A=0.01\ \text{m}^{2}\) rotates about an axis perpendicular to a uniform magnetic field of magnitude \(B=0.5\ \text{T}\). The coil starts from rest with its plane parallel to the field (\(\theta=0\)). A constant torque of \(\tau=0.02\ \text{N·m}\) is applied, and the coil has a moment of inertia \(I=0.01\ \text{kg·m}^{2}\). Find the magnitude of the induced emf at \(t=4\ \text{s}\). (Give your answer in volts to two decimal places.)
Answer Options
A.
2.78
B.
2.10
Correct Answer
C.
2.31
D.
2.55
Correct Answer
C
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