Question on: JAMB Physics - 2024
The value of R required to make the galvanometer measure voltage up to 40V in the diagram above
A
1885 Ω
B
1990 Ω
C
1995 Ω
D
1100 Ω
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Correct Option: B
Here's how to solve this problem:
1. Understand the Setup: The diagram shows a galvanometer (a sensitive current-measuring device) being converted into a voltmeter. This is done by connecting a resistor (R) in series with the galvanometer.
2. Relevant Formulas:
- Ohm's Law: V = IR
- When resistors are connected in series, the total resistance is the sum of individual resistances.
3. Given Information: Galvanometer resistance (G) is assumed to be 10 Ω (necessary to solve the problem).
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