: A potentiometer wire of length 4 m has a resistance of 8 Q. It is connected in series with a battery of e.m.f. 2 V and negligible internal resistance. If the e.m.f. of a cell balances against a length of 217 cm of the wire, find the em.f. of a cell. When the cell is shunted by a resistance of 15 92, the balancing length is reduced to 200 cm. Find the internal resistance of the cell.
: A potentiometer wire of length 4 m has a resistance of 8 Q. It is connected in series with a battery of e.m.f. 2 V and negligible internal resistance. If the e.m.f. of a cell balances against a length of 217 cm of the wire, find the em.f. of a cell. When the cell is shunted by a resistance of 15 92, the balancing length is reduced to 200 cm. Find the internal resistance of the cell.
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Transcribed Image Text:: A potentiometer wire of length 4 m has
a resistance of 8 . It is connected in series
with a battery of e.m.f. 2 V and negligible
internal resistance. If the e.m.f. of a cell
balances against a length of 217 cm of the
wire, find the em.f. of a cell. When the cell is
shunted by a resistance of 15 , the balancing
length is reduced to 200 cm. Find the internal
resistance of the cell.
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