Question
Download Solution PDFA DC potentiometer uses a slide wire of 800 mm. A standard cell of emf 1.18 V obtains balance at 600 mm. A test cell is seen to obtain balance at 660 mm. The emf of the test cell is
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
In a potentiometer
- E ∝ L ∝ R
- Where,
- E = emf of test cell
- L = Balancing length of slide wire
- R = Slide wire resistance
Also
- \(\frac{{{E_1}}}{{{E_2}}} = \frac{{{L_1}}}{{{L_2}}} = \frac{{{R_1}}}{{{R_2}}}\)
Note:
● Potentiometer is a zero order circuit, because no energy storing element is there.
Calculation:
Given-
E1 = 1.18 V
L1 = 600 mm
L2 = 660 mm
\(\frac{{1.18}}{{{E_2}}} = \frac{{600}}{{660}}\)
E2 = 1.30 V
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