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NTA Abhyas JEE Main2020PhysicsCurrent ElectricityPractice

A resistance R whose value is varied from 1 Ω to 5 Ω is connected to a cell of internal resistance 3 Ω . The power consumed by R

Options

  1. Aincreases continuously
  2. Bdecreases continuously
  3. Cfirst decreases then increases
  4. Dfirst increases then decreases

Correct answer

D. first increases then decreases

Step-by-step solution

P = E R + 3 2 R dP dR = 0 at R = 3 Ω so power is maximum at Therefore increase continuously till R = 3 Ω and then decreases

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