The reading of the ideal voltmeter in the adjoining diagram will be ................. $V$
A$4$
B$8$
C$12$
D$14 $
Medium
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B$8$
b Current flowing in the circuit $i = \frac{E}{R} = \frac{{10 - 4}}{{20 + 10}} = \frac{1}{5}\,A$
$P.D.$ across $AC $$ = \frac{1}{5} \times 20 = 4\,V$
$P.D.$ across $AN = 4 + 4 = 8\,V$
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Two wires $A$ and $B $ of same material and same mass have radius $2r$ and $r$ . If resistance of wire $A$ is $34\,\Omega $, then resistance of $B$ will be ............ $\Omega$
A $100\, V$ voltmeter of internal resistance $20\,k\Omega $ in series with a high resistance $R$ is connected to a $110\, V$ line. The voltmeter reads $5\, V$, the value of $R$ is ................ $k \Omega $
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