Which one of the following equation is correct for the circuit shown. The currents in each brach of circuit are indicated and all three cells are ideal.

Options

A. `2-I_(1)-2I_(2)=0`
B. `2-2I_(1)-2I_(2)-4I_(3)=0`
C. `4-I_(1)+4I_(3)=0`
D. `-2-I_(1)-2I_(2)=0`

Answer

D

Explanation

Applying Kirchoff voltage law in left loop.
`-2+I_(1)+4+2I_(2)=0 thereofre 2+I_(1)+2I_(2)=0`