waec model questions vol1 2019 physics
Objective • Question 12
Question 12
WAEC_MODEL_QUESTIONS_VOL1
•
2019
A rectangular coil of 20 turns has dimensions 0.10 m by 0.20 m. It is pulled with a constant speed of 0.5 m s⁻¹ into a uniform magnetic field of 0.30 T that is perpendicular to the plane of the coil. When exactly half of the coil's area is inside the field, what magnitude of the external force must be applied to keep the coil moving at constant speed? (The coil's resistance is 2 Ω.)
Answer Options
Correct Answer
A.
0.36
B.
0.72
C.
0.45
D.
0.18
Correct Answer
A
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