Multiple choice

If the cell is replaced by another cell, the balance point shifts to 60 cm. What is the emf of the second cell, if a potentiometer arrangement a cell of emf 1.25 V gives a balance point at 35 cm length of the wire?

  1. 1680 V

  2. 2.14 V

  3. 2625 V

  4. 0.0006 V

  5. 0.729 V
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

E1= 1.25 V l1 = 35 cm l2 = 60 cm E1/E2 = l1/l2 E2 = l2 E1/ l1 E2 = 60 x 1.25/35 E2 = 2.14 V

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