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Statement I: In the potentiometer circuit shown in figure. `E_1 and E_2` are the emf of cells `C_1 and C_2`, repsectively, with `E_1gtE_2`. Cell `C_1` has negligible internal resistance. For a given resistor R, the balance length is x. If the diameter of the potentiometer wire AB is increased, the balance length x will decrease. Statement II: At the balance point, the potential difference between AD due to cell `C_1 is E_2` , the emf of cell `C_2`.A. Statement I is true, Statement II is True, Statement II is a correct explanation for Statement I.B. Statement I is True, Statement II is True, Statement II is not a correct explanation for Statement I.C. Statement I is True, Statement II is False.D. Statement I is False, Statement II is True. |
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Answer» Correct Answer - D d. If the diameter of wire AB is increased, its resistance will decrease. Hence, the potential difference between A and B due to cell `C_1` will decrease. Therefore, the null point will be obtained at a higher value of x. |
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