In a potentiometer arrangement, a cell gives a balancing point at 75 cm length of wire. This cell is now replaced by another cell of unknown emf. If…

Question

In a potentiometer arrangement, a cell gives a balancing point at 75 cm length of wire. This cell is now replaced by another cell of unknown emf. If the ratio of the emf's of two cells respectively is 3:2, the difference in the balancing length of the potentiometer wire in above two cases will be _____ cm.

MARKS Content Team · Accepted Answer

Correct answer: 25. If the potential difference between the potentiometer is V and the potential of the battery is ε. Then, (ε)/V=l/L Therefore, ε_1ε_2=l_1l_2⇒3/2=75/x⇒x=50 cm Therefore, the difference in the balancing length is 75-50=25 cm

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