In the circuit shown in the figure, the current flowing in $2\,\Omega $ resistance ............... $A$
A$1.4$
B$1.2$
C$0.4$
D$1$
Medium
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D$1$
d Current through $2\, \Omega $ $ = 1.4\left\{ {\frac{{(25 + 5)}}{{(10 + 2) + (25 + 5)}}} \right\} = 1\,A$
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Resistance of $100\, cm$ long potentiometer wire is $10 \,\Omega$, it is connected to a battery ($2\, volt$) and a resistance $R$ in series. A source of $10\, mV$ gives null point at $40\, cm$ length, then external resistance $R$ is ........... $\Omega $
The potential difference across the $100\,\Omega$ resistance in the following circuit is measured by a voltmeter of $900 \,\Omega$ resistance. The percentage error made in reading the potential difference is
For a cell terminal $P.D.$ is $2.2\;V$ when circuit is open and reduces to $1.8\;V$ when cell is connected to a resistance of $R = 5\,\Omega $. Determine internal resistance of cell $(r)$ is then ........ $\Omega$