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Q. The internal resistance of a cell of e.m.f. $2 \,V$ is $0.1\, \Omega$ It is connected to a resistance of $3.9\, \Omega$. The voltage across the cell will be

AIPMTAIPMT 1999Current Electricity

Solution:

$i=\frac{2}{4}=0.5$ Ampere
$V= \, \varepsilon -ir$
or $V = 2-0.5 \times 0.1= 1.95\, V$