Current Electricity — Important Questions
Maharashtra Board · Class 12 · Physics
45 important questions from Current Electricity for Maharashtra Board Class 12 Physics, with answers. Written for the board exams 2027.
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Important Questions from Current Electricity
Which of the following are applications of Kirchhoff's laws? (Multiple correct)
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Circuit analysis, Finding unknown currents, Designing electrical networks, Analyzing complex circuits
Kirchhoff's laws are fundamental for circuit analysis, finding unknown currents and voltages, designing electrical networks, and analyzing complex circuits. They don't directly measure resistance.
In a metre bridge, if the balance point is at 40 cm from left end and the known resistance is 6 Ω, the unknown resistance is:
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4 Ω
In metre bridge: X/R = l₁/l₂, where l₁ = 40 cm, l₂ = (100-40) = 60 cm, R = 6 Ω. Therefore, X = R × l₁/l₂ = 6 × 40/60 = 4 Ω
The internal resistance of a cell can be measured using:
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Potentiometer
Potentiometer is the most accurate method to measure internal resistance of a cell as it draws no current at balance condition, giving true EMF measurement.
A galvanometer has resistance 25 Ω and full scale deflection current 50 μA. To convert it into a voltmeter of range 5 V, the series resistance required is:
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99,975 Ω
Given: G = 25 Ω, Ig = 50 μA = 50×10⁻⁶ A, V = 5 V. Series resistance X = V/Ig - G = 5/(50×10⁻⁶) - 25 = 100,000 - 25 = 99,975 Ω
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