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In the given figure, there is a circuit of potentiometer of length AB = 10 m. The resistance per unit length is `0.1Omega` 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 :

A

5V

B

`2.25` V

C

6 V

D

`2.75` V

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