Current Electricity — Practice Quiz
Maharashtra Board · Class 12 · Physics
Try a 4-question quiz on Current Electricity for Maharashtra Board Class 12 Physics: tap an answer to check it and see why.
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Quick Quiz: Current Electricity
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According to Kirchhoff's first law, the algebraic sum of currents at a junction is:
In a Wheatstone bridge, the condition for balance is:
A galvanometer with resistance 50 Ω gives full scale deflection for 2 mA current. To convert it into an ammeter of range 2 A, the shunt resistance required is:
The potential gradient in a potentiometer is 2 mV/cm. If the balance length for a 1.5 V cell is:
Sample Questions
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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