(D) The $emf$ of a dry cell depends on the electrode potentials of the cathode and anode,which are determined by the chemical reactions occurring and

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(D) The $emf$ of a dry cell depends on the electrode potentials of the cathode and anode,which are determined by the chemical reactions occurring and the concentration of the electrolyte.It does not depend on the physical dimensions or the size of the cell.Therefore,both the Assertion and the Reason are incorrect.

Class 12 Physics Current Electricity Electric Cells and Combination of cells in Series and Parallel

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Assertion : $A$ larger dry cell has higher $emf$.
Reason : The $emf$ of a dry cell is proportional to its size.

AIIMS 2004 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

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Current Electricity

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Electric Cells and Combination of cells in Series and Parallel

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Assertion : $A$ larger dry cell has higher $emf$.Reason : The $emf$ of a dry cell is proportional to its size.

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$A$ car battery of $e.m.f.$ $12\,V$ and internal resistance $5 \times 10^{-2}\,\Omega$,receives a current of $60\,A$ from an external source. What is the terminal voltage of the battery (in $,V$)?

When two identical batteries of internal resistance $1 \Omega$ each are connected in series across a resistor $R$,the rate of heat produced in $R$ is $J_1$. When the same batteries are connected in parallel across $R$,the rate is $J_2$. If $J_1 = 2.25 J_2$,then the value of $R$ in $\Omega$ is

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Assertion : $A$ larger dry cell has higher $emf$.
Reason : The $emf$ of a dry cell is proportional to its size.