In the given circuit, an ideal voltmeter connected across the 10 Ω resistance reads 2V. The internal resistance r, of each cell is :

Question

In the given circuit, an ideal voltmeter connected across the 10 Ω resistance reads 2V. The internal resistance r, of each cell is : (A) 1 Ω (B) 1.5 Ω (C) 0Ω (D) 0.5Ω

Tardigrade Admin · Accepted Answer

Req = (15×10/25) + 2 +2r = 8 + 2r i = (3/ 8+2r) 2 = i Req = (3/8 + 2 r ) ×6 16 +4r = 18 ⇒ r = 0.5 Ω

Q. In the given circuit, an ideal voltmeter connected across the $10 Ω$ resistance reads $2 V$ .
The internal resistance $r$ , of each cell is :

$1Ω$

$1.5Ω$

$0Ω$

$0.5Ω$

$R_{e q} = \frac{15 \times 10}{25} + 2 + 2 r$
$= 8 + 2 r$
$i = \frac{3}{8 + 2 r}$
$2 = i R_{e q} = \frac{3}{8 + 2 r} \times 6$
$16 + 4 r = 18$
$\Rightarrow r = 0.5Ω$

Q. In the given circuit, an ideal voltmeter connected across the 10Ω resistance reads 2V. The internal resistance r, of each cell is :

1Ω

1.5Ω

0Ω

0.5Ω