Question

The magnitude of $I$ in ampere unit is

• A. 0.1
• B. 0.3
• C. 0.6
• D. none of these

Answer 1

Answer: (A)

All the resistances are in paralleI order, so voitage across them will be equal.

$\therefore 60I=(15+5)I_1$
$\Rightarrow 60I=20I_1$
$\Rightarrow I_1=3I\dots (i)$
Again $(15+5)I_1=10(1-I-I_1)$
$\Rightarrow 2I_1=1-I-I_1$
$\Rightarrow 2(3I)=1-I-3I$
$\Rightarrow 6I+4I=1$
$\Rightarrow 10I=1$
$\therefore I=\frac{1}{10}=0.1A$