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Emf Of A Cell MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET
Quick Facts
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Cell and Emf of a cell is considered one of the most asked concept.
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13 Questions around this concept.
Solve by difficulty
In the circuit shown, current (in A) through the 50 V and 30 V batteries are, respectively :
In the above circuit value of R=10 r. If a total current of 1A is flowing through the circuit the value of E is?
A, B, and C are voltmeters of resistance R, 1.5R, and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are VA, VB, and VC respectively. Then:
The potential difference (VA - VB) between the points A and B in the given figure is
The emf of a dry cell depends upon the following factors:
In the given circuit, the potential difference across the capacitor is 12 V . Each resistance is of $3 \Omega$ and the cell is ideal. The emf of the cell is:
A cell of e.m.f volt with no internal resistance is connected to a wire whose cross section changes. The wire has three sections of equal length. The middle section has a radius , whereas the radius of the outer two sections is 2. The ratio of the potential difference across section to the potential difference across section is
A torch bulb rated 4.5 W, 1.5 V is connected as shown in Figure. The e.m.f. of the cell needed to make the bulb glow at full intensity is
Consider a cell of e. m. f. E and internal resistance r. Its terminals are directly connected. Some current is obtained in the circuit. Now take two such cells
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Concepts Covered - 1
Cell and Emf of a cell
Cell
The device which converts Chemical energy into electrical energy is known as an electric cell.
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It maintains the flow of charge inside the circuit by supplying energy.
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The direction of flow of current:
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inside the cell is from negative to positive electrode
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while outside the cell is from positive to negative electrode.
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Electromotive force (Emf) of a cell:
It is the work done / energy carried by unit charge passing through one complete cycle of the circuit.
E=W/q
unit of emf is volt.
The emf of cell is also known as potential difference across the terminals of a cell when it is not giving any current.
Note-Cell is a source of constant emf but not constant current.
Potential difference (V)- It is the work done / energy carried by unit charge passing through external part (excluding the cell ) of the circuit.
Potential difference is equal to the product of current and resistance of that given part.
i.e. $V_{A B}=i R$.
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