Q51.In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of 2Ω the balancing length becomes 120 cm. The internal resistance of the cell is (1) 1Ω (2) 0.5Ω (3) 4Ω (4) 2Ω
What This Question Tests
This question tests the application of the potentiometer principle to determine the internal resistance of a cell by comparing its EMF with its terminal voltage when shunted.
Concepts Tested
Formulas Used
r = R_sh * (L1 - L2) / L2
V = E * R_sh / (R_sh + r)
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📋 Question Details
- Chapter
- Current Electricity
- Topic
- Potentiometer
- Year
- 2005
- Shift
- Unknown
- Q Number
- Q51
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 3: Current Electricity
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