MHT CET · Physics · Current Electricity
The length of potentiometer wire is \(4 \mathrm{~m}\) and is connected in series with an
accumulator. The e.m.f. (Unknown) of a cell balances against \(1 \cdot 5 \mathrm{~m}\) length of wire.
If the length of potentiometer wire is doubled, then the new balancing length of
wire will be
- A \(4.5 \mathrm{~m}\)
- B \(1.5 \mathrm{~m}\)
- C \(0.75 \mathrm{~m}\)
- D \(3 \mathrm{~m}\)
Answer & Solution
Correct Answer
(D) \(3 \mathrm{~m}\)
Step-by-step Solution
Detailed explanation
If the length is doubled, potential gradient will be half. So to balance the same battery it will take double the length.
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