In the given figure, there is a circuit of potentiometer of length AB = 10Ω. The resistance....

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In the given figure, there is a circuit of potentiometer of length AB = 10Ω. The resistance per unit length is 0.1W per cm. Across AB, a battery of emf E and internal resistance ‘r’ is connected. The maximum value of emf measured by this potentiometer is:

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