JAMB Physics 2010 Objective — Question 41
Question 41 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2010 Objective paper, with the correct answer and a full explanation.
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41. A galvanometer with a full-scale deflection of 10 mA is to be converted to a voltmeter with full-scale deflection of 5 V. If a series resistance of 498 ohms is used for the conversion, the resistance of the galvanometer is A. 2 ohms B. 10 ohms C. 5 ohms D. 1 ohm
- A. 2 ohmsCorrect
- B. 10 ohms
- C. 5 ohms
- D. 1 ohm
Explanation
The multiplier resistance, Rm = V/Ig - rg. 498 = 5/(10x10^-3) - rg. 498 = 500 - rg. rg = 500-498 = 2 ohm.
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