A moving coil galvanometer of resistance 100ohm gives half scale deflection for a current of .20mA. What will be the potential difference across it?
Correct answer: D. 0.4 volt
- A. 4 volt
- B. 5 volt
- C. 2 volt
- D. 0.4 volt
Explanation
Calculating Potential Difference Across a Moving Coil GalvanometerGiven:- Resistance of the galvanometer (\( R \)) = 100 ohms- Current for half scale deflection (\( I \)) = 0.20 mA = \( 0.20 \times 10^{-3} \) A#### Correct Calculation:The potential difference (\( V \)) across the galvanometer can be calculated using Ohm's law: \( V = IR \).#### Calculations for Correct Option (d) 0.4 volt:Given \( I = 0.20 \times 10^{-3} \) A and \( R = 100 \) ohms:\[ V = IR = 0.20 \times 10^{-3} \times 100 = 0.02 \, \text{V} \]### Explanation of Correct Option:The potential difference across the moving coil galvanometer, using the provided values and Ohm's law, is calculated to be \( 0.02 \) volts, equivalent to \( 0.02 \) volt or \( \text{0.02 V} \).
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