First slide

potentiometer

Question

In the network shown, when switch S is open balancing length AN₁ = 60 cm and when the switch S is closed, balancing length AN₂ = 50 cm. then the value of r is

Moderate

A

0.75 Ω
B

1.5 Ω
C

0.5 Ω
D

1 Ω

Solution

$r = R (\frac{i_{1}}{i_{2}} - 1) = 5 (\frac{60}{50} - 1) Ω = 1 Ω$

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