WAEC Physics 2015 Objective — Question 45
Question 45 of 50 from the West African Examinations Council (WAEC) Physics 2015 Objective paper, with the correct answer and a full explanation.
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When current flows through a moving-coil galvanometer, the force exerted on the pointer depends on the: I. strength of the current; II. magnetic field strength; III. length of the coil. Which of the statement(s) above is/are correct?
- A. I only
- B. II only
- C. I and III only
- D. I, II and IIICorrect
Explanation
The deflecting force/torque on the coil depends on the current strength, the magnetic field strength, and the length (and other dimensions) of the coil, so all three (I, II and III) are correct.
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