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MHT CET202123 Sep 2021Morning ShiftPhysicsCurrent ElectricityActual

In a potentiometer experiment, when three cells A , B and C are connected in series, the balancing length is found to be 420 ~cm . If cells A and B are connected in series the balancing length is 220 ~cm and for cells B and C connected in series the balancing length is 320 ~cm . The emf of cells A, B and C are respectively in the ratio of

Options

  1. A2:3:5
  2. B5:4:3
  3. C1:1.2:2
  4. D1.2:1:2

Correct answer

C. 1:1.2:2

Step-by-step solution

aligned & E _ A + E _ B + E _ C = x (420) [ x = potential gradient ] & E _ A + E _ B = x (220) E _ C = x (420)- x (220)= x (200) & E _ B + E _ C = x (320) E _ B = x (320)- x (200)= x (120) & E _ A = x (220)- E _ B = x (100) & E _ A : E _ B : E _ C =100: 120: 200=1: 1.2: 2 aligned

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