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The reading of ammeter in the figure shown below is

Option: 1
$4 \mathrm{~A}$

Option: 2
$6 \mathrm{~A}$

Option: 3
$8 \mathrm{~A}$

Option: 4
$12 \mathrm{~A}$

Answers (1)

best_answer

Distributing the currents in the circuit according to kirchoff loop law.
In ideal voltmeter current $= 0$ .

$\Rightarrow$ Apply kirchoff's law in loop $\mathrm{A B C D A}$ .
$\mathrm{\Rightarrow-3 I_{1}+6+12=0}$ .
$\mathrm{\Rightarrow I_{1}=6 \mathrm{~A} }$ .

Apply kirchoff's loop law in $\mathrm{A F B A}$
$\mathrm{\Rightarrow 8-\left(I-I_{1}\right) \times 10-6+3 I_{1}=0}$
$\mathrm{\Rightarrow 10 I-13 I_{1}=2}$ .
$\mathrm{\Rightarrow I=\frac{2}{10}+\frac{13}{10} \times 6=8 \mathrm{~A}}$ .
$\mathrm{\Rightarrow}$ Reading of ammeter $\mathrm{= I=8 \mathrm{~A}}$

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