WAEC Physics 2013 Objective — Question 38
Question 38 of 50 from the West African Examinations Council (WAEC) Physics 2013 Objective paper, with the correct answer and a full explanation.
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A galvanometer of internal resistance 10Ω has a full scale deflection with a current of 10 mA. Calculate the magnitude of the resistance required to convert it to a voltmeter capable of measuring up to 3V.
- A. 290 ΩCorrect
- B. 300 Ω
- C. 333 Ω
- D. 1000 Ω
Explanation
Using V = I(Rg+R): 3 = 10×10⁻³×(10+R); 300 = 10+R; R = 290Ω.
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