Vivek Kohli

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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.

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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.

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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.

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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.

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Vivek Kohli

Asked: February 21, 2025In: Class 12 Physics

In Wheatstone’s bridge, all the four arms have equal resistance R. If resistance of the galvanometer arm is also R, then equivalent resistance of the combination is

The Wheatstone bridge is balanced since all four arms have equal resistance R. The galvanometer arm also has resistance R. The equivalent resistance of the entire network simplifies to R, using series-parallel reduction. Hence, the correct answer is (a) R.

Vivek Kohli

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 :

In Wheatstone’s bridge, all the four arms have equal resistance R. If resistance of the galvanometer arm is also R, then equivalent resistance of the combination is

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