waec model questions vol1 2024 physics
Objective • Question 14
Question 14
WAEC_MODEL_QUESTIONS_VOL1
•
2024
A coil with 200 turns is placed in a magnetic field of strength 0.5 T. If the area of the coil is 0.1 m² and the magnetic flux changes from 0.2 Wb to 0.5 Wb in 4 seconds, calculate the induced electromotive force (emf) in the coil. Discuss the implications of Lenz's law in this scenario.
Answer Options
A.
-5 V; The induced emf is unrelated to Lenz's law.
Correct Answer
B.
-15 V; The induced emf opposes the change in magnetic flux.
C.
-10 V; The induced emf enhances the change in magnetic flux.
D.
-20 V; The induced emf has no effect on the magnetic flux.
Correct Answer
B
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