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14/09/2021 11:43 am
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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) 60 cm
(2) 21.6 cm
(3) 64 cm
(4) 62 cm
1 Answer
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14/09/2021 11:47 am
Answer: (1) 60 cm
Explanation:
\(\frac{E_1}{E_2}\) = \(\frac{ϕ \ell_1}{ϕ \ell_2}\)
\(\frac{1.5}{2.5}\) = \(\frac{36}{\ell_2}\)
⇒ \(\ell_2\) = 36 x \(\frac{5}{3}\) = 60 cm
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