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)

0.1

Answer 2

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

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