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In the circuit shown in figure, ammeter and voltmeter are ideal. If E = 4 V, $R = 15 Ω$ and $r = 1 Ω,$ then reading of ammeter (in A) and voltmeter (in V), respectively, are

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10/3, 2/3

2/3, 11/3

none of these

2/3, 10/3

answer is B.

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Detailed Solution

All the three R are in parallel.

$\begin{array}{l} I = \frac{E}{r + R / 3} = \frac{4}{1 + 15 / 3} = \frac{2}{3} A \\ V = I (R / 3) = \frac{2}{3} \times \frac{15}{3} = \frac{10}{3} V \end{array}$

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