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In the given circuit , an ideal voltmeter connected across the $10\Omega$

resistance reads 2V. The internal resistance r , of each cell is :

Option 1)

Option 2)

Option 3)

Option 4)

Answers (1)

best_answer

In series Grouping -

$R_{eq}=R_{1}+R_{2}+R_{3}+\cdot \cdot \cdot +R_{n}$

- wherein

$R_{eq}-$ Equivalent Resistance

In parallel Grouping -

$\frac{1}{R_{eq}}=\frac{1}{R_{1}}+\frac{1}{R_{2}}+\cdot \cdot \cdot +\frac{1}{R_{n}}$

-

So,

V = 6 x i = 2

$i=\frac{1}{3}A$

$i=\frac{2E}{2r+2+6}$

$=\frac{2\times 1.5}{2r+8}$

$=\frac{1}{3}$

=> $9=2r+8$

=> $r=0.5\Omega$

Option 1)

Option 2)

Option 3)

Option 4)

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