Question

All resistances in figure are 1 Ω each. The value of current ‘I‘ is (a/5) A. The value of a is _______.

Fig.

Answer 1

The correct answer is 8

Fig.

Let the current is i
Using kirchhoff’s law
$iR+\frac{i}{2}R+\frac{i}{4}R+\frac{i}{8}R=3$
$i=\frac{3×8}{15}$
$=\frac{8}{5} A$
$\therefore$ the value of a is 8