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Current Electricity question

2021 · Q138
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Current Electricity question

2021 · Q138

NEETPhysicsCurrent ElectricityMCQ+4 / −1
In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?
  1. A
    62 cm
  2. B
    60 cm
  3. C
    21.6 cm
  4. D
    64 cm
View written solutionFree

Correct answer: B

ϕ\phiϕ = constant

Eunknown = ϕ\phiϕ Ib

⇒\Rightarrow⇒ Eunknown ∝\propto∝ Ib

E1E2=I1I2⇒1.52.5=36x{{{E_1}} \over {{E_2}}} = {{{I_1}} \over {{I_2}}} \Rightarrow {{1.5} \over {2.5}} = {{36} \over x}E2​E1​​=I2​I1​​⇒2.51.5​=x36​

x=36×53=60x = {{36 \times 5} \over 3} = 60x=336×5​=60 cm

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