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A potential difference of 2V exists across a potentiometer wire of 2m length. When the potential difference across a 2Ω resistance of a second circuit is measured by this potentiometer wire, it amounts to 5mm balancing length. The current in the second circuit is
  • a)
    250A
  • b)
    25 x 10-4 A
  • c)
    1.5 A
  • d)
    2.5 A
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A potential difference of 2V exists across a potentiometer wire of 2m ...
2.5 mA
Potential gradient in the wire
= 2 2 = 1V/m
P.D. across a balancing length of 5 mm
= 5 x 10-3 x 1
= 5 x 10-3 V
∴ Current in the second circuit
= 5 x 10 − 3 2 = 2.5 x 10-3 A
= 25 x 10-4 A
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A potential difference of 2V exists across a potentiometer wire of 2m length. When the potential difference across a 2Ω resistance of a second circuit is measured by this potentiometer wire, it amounts to 5mm balancing length. The current in the second circuit isa)250Ab)25 x 10-4 Ac)1.5 Ad)2.5 ACorrect answer is option 'B'. Can you explain this answer?
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