Q19.The actual value of resistance R , shown in the figure is 30Ω. This is measured in an experiment as shown using the standard formula R = VI , where V and I are the readings of the voltmeter and ammeter, respectively. If the measured value of R is 5% less, then the internal resistance of the voltmeter is: (1) 35Ω (2) 600Ω (3) 570Ω (4) 350Ω
What This Question Tests
This question assesses the understanding of how a non-ideal voltmeter with finite internal resistance affects resistance measurement when connected in parallel with the resistor.
Concepts Tested
Formulas Used
R_measured = V/I
R_parallel = (R1 * R2) / (R1 + R2)
Percentage error = (R_actual - R_measured)/R_actual * 100
📚 NCERT Sections This Tests
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3.2 A battery of emf 10 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?
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4.10 Two moving coil meters, M1 and M2 have the following particulars: R1 = 10 Ω, N1 = 30, A1 = 3.6 × 10–3 m2, B1 = 0.25 T R2 = 14 Ω, N2 = 42, A2 = 1.8 × 10–3 m2, B2 = 0.50 T (The spring constants are identical for the two meters). Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M2 and M1.
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📋 Question Details
- Chapter
- Current Electricity
- Topic
- Ammeter and Voltmeter
- Year
- 2019
- Shift
- 10 Jan Shift 2
- Q Number
- Q19
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 3: Current Electricity
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