WAEC Physics 2012 Objective — Question 44
Question 44 of 50 from the West African Examinations Council (WAEC) Physics 2012 Objective paper, with the correct answer and a full explanation.
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A wire of length 30 cm is moved with a speed of 2 ms⁻¹ at right-angles to a magnetic field of flux density 0.4T. Calculate the e.m.f induced in the wire.
- A. A. 0.15 V
- B. B. 0.24 VCorrect
- C. C. 2.70 V
- D. D. 24.00 V
Explanation
Induced emf = BIL x speed = B x L x v = 0.4 x 0.3 x 2 = 0.24V.
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