waec model questions vol1 2021 physics
Objective • Question 2
Question 2
WAEC_MODEL_QUESTIONS_VOL1
•
2021
A rectangular coil of 20 turns has dimensions 0.10 m (width) × 0.20 m (length). It moves with constant speed v into a uniform magnetic field of magnitude 0.50 T that is directed into the page. The plane of the coil remains perpendicular to the field. When the coil is half inside the field region the measured induced emf is 0.80 V. The total resistance of the coil is 2.0 Ω. (a) Determine the speed v of the coil. (b) Find the magnitude of the magnetic force acting on the coil at that instant (assume the induced current opposes the motion).
Answer Options
A.
v = 0.25 m\/s; F = 0.50 N
B.
v = 0.40 m\/s; F = 0.60 N
C.
v = 0.55 m\/s; F = 0.90 N
Correct Answer
D.
v = 0.40 m/s; F = 0.80 N
Correct Answer
D
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