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3. current electricity — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics3. current electricity1 Mark
MCQ
In potentiometer a balance point is obtained, when
  • A
    The $e.m.f.$ of the battery becomes equal to the $e.m.f.$ of the experimental cell
  • ✓
    The $p.d.$ of the wire between the $+ve$ end to jockey becomes equal to the $e.m.f.$ of the experimental cell
  • C
    The $p.d.$ of the wire between $+ve$ point and jockey becomes equal to the $e.m.f.$ of the battery
  • D
    The $p.d.$ across the potentiometer wire becomes equal to the $e.m.f.$ of the battery
✓

Answer

Correct option: B.
The $p.d.$ of the wire between the $+ve$ end to jockey becomes equal to the $e.m.f.$ of the experimental cell
b
(b) In general, if the arrangement is not balanced, there will be a potential difference across the galvanometer, $G.$ This will only be zero means balance when the $p.d.$ of the wire between the $+ve$ end of battery to jockey becomes equal to the $e.m.f.$ of the experimental cell.

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