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Vivek Kohli

Asked: February 21, 2025In: Class 12 Physics

For a cell of emf 2 V, a balance is obtained for 50 cm of the potentiometer wire. If the cell is shunted by a 2 n resistor and the balance is obtained across 40 cm of the wire, then the internal resistance of the cell is:

Using the potentiometer principle: E∝L Initially, the balance length is L₁ = 50 cm. When the cell is shunted by Rₛ = 2 Ω, the new balance length is L₂ = 40 cm. Class 12th Science Physics NCERT MCQ Questions

Poll

Vivek Kohli

Asked: February 21, 2025In: Class 12 Physics

Two cells when connected in series are balanced on 8 m on a potentiometer. If the cells are connected with polarities of one of the cell is reversed, they balance on 2 m. The ratio of the cmf’s of the two

Let the EMFs of the two cells be E₁ and E₂. In series: E₁ + E₂ ∝ 8 m With one reversed: E₁ – E₂ ∝ 2 m Solving, (E₁ + E₂) / (E₁ – E₂) = 8/2 = 4.

Poll

Vivek Kohli

Asked: February 21, 2025In: Class 12 Physics

A cell of internal resistance 3 Ω and emf 10 V is connected to a uniform wire of length 500 cm and resistance 3 Ω. The potential gradient in the wire is

Total resistance is 6Ω, current is 5/3 A, potential drop across the wire is 5V and the potential gradient is 10 mV/cm. Correct answer: (b) 10 mV/cm. Class 12th Science Physics NCERT MCQ Questions NCERT Books MCQ Questions Session 2024-2025.

Poll

Vivek Kohli

Asked: February 21, 2025In: Class 12 Physics

When two resistances R₁ and R₂ are connected in series, they consume 12 W power. When they are connected in parallel, they consume 50 W power. What is the ratio of the Power of R₁ and R₂?

Using power formulas for series and parallel combinations, the ratio of power consumed by R₁ and R₂ is 1/4. Correct answer: (a) 1/4. Class 12th Science Physics NCERT MCQ Questions NCERT Books MCQ Questions Session 2024-2025.

Poll

Vivek Kohli

Asked: February 21, 2025In: Class 12 Physics

A cell supplies a current of 0-9 A through a 2Ω resistor and a current of 0-3 A through 7 Ω resistor. The internal resistance of the cell is :

The internal resistance of the cell is 0.5 Ω, calculated using Ohm’s law by equating EMF expressions for both resistor cases. Correct answer: (d). Class 12th Science Physics NCERT MCQ Questions NCERT Books MCQ Questions Session 2024-2025.

For a cell of emf 2 V, a balance is obtained for 50 cm of the potentiometer wire. If the cell is shunted by a 2 n resistor and the balance is obtained across 40 cm of the wire, then the internal resistance of the cell is:

Two cells when connected in series are balanced on 8 m on a potentiometer. If the cells are connected with polarities of one of the cell is reversed, they balance on 2 m. The ratio of the cmf’s of the two

A cell of internal resistance 3 Ω and emf 10 V is connected to a uniform wire of length 500 cm and resistance 3 Ω. The potential gradient in the wire is

When two resistances R₁ and R₂ are connected in series, they consume 12 W power. When they are connected in parallel, they consume 50 W power. What is the ratio of the Power of R₁ and R₂?

A cell supplies a current of 0-9 A through a 2Ω resistor and a current of 0-3 A through 7 Ω resistor. The internal resistance of the cell is :

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