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प्रश्न
A potential gradient of a wire is 0.5 V/m. If the e.m.f. of a cell balances against 216 cm of this potentiometer wire, calculate e.m.f. of the cell.
संख्यात्मक
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उत्तर
Given: Potential gradient (k) = 0.5 V/m
Balancing length (L) = 216 cm
= 2.16 m
To find: E.m.f. of the cell (E) = ?
Formula: E = kL
= 0.5 × 2.16
= 1.08 V
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