Question

What is the possible value of i2

Answer 1

Let the potential drop across 10Ω, 15Ω or 30Ω be V.
Thus current flowing through 10Ω, I
1
​
=V/10
Similarly, current flowing through 15Ω, I
1
​
=V/15
Similarly, current flowing through 30Ω, I
1
​
=V/30
∴ I
1
​
:I
2
​
:I
3
​
=
10
V
​
:
15
V
​
:
30
V
​
=3:2:1
⟹ I
1
​
=1.5I
2
​
and I
3
​
=0.5I
2
​

But I
1
​
+I
2
​
+I
3
​
=1.2
∴ 1.5I
2
​
+I
2
​
+0.5I
2
​
=1.2
⟹ I
2
​
=
3
1.2
​
=0