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​There is a potentiometer wire of length 1200 cm and 60 mA current is flowing in it. A battery of emf 5V and internal resistance of 20Ω is balanced on potentiometer wire with balancing length 1000 cm. The resistance of potentiometer wire is–
  • a)
    80 W    
  • b)
    100 W    
  • c)
    120 W    
  • d)
    60 W 
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
There is a potentiometer wire of length 1200 cm and 60 mA current is f...

Potential gradient = 5 / 1000 = Vp/1200
 VP = 6V
and RP = = 100Ω
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There is a potentiometer wire of length 1200 cm and 60 mA current is flowing in it. A battery of emf 5V and internal resistance of 20Ω is balanced on potentiometer wire with balancing length 1000 cm. The resistance of potentiometer wire is–a)80 W b)100 W c)120 W d)60 WCorrect answer is option 'B'. Can you explain this answer?
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