Question

In the circuit shown, current (in A) through the 50 V and 30 V batteries are, respectively :

• A. 3.5 and 2
• B. 3 and 2.5
• C. 2.5 and 3
• D. 4.5 and 1

Answer 1

The correct option is D 4.5 and 1

Let the current flowing through the circuit as shown in the diagram
From the circuit we have,

$50=20I_1$

$30=10I_3$

Further, using Kirchhoff's loop rule we get

$20I_1=10I_2+10I_3$

or

$2I_1=I_2+I_3$

or

$I_2=2A$

And

$I=I_1+I_2$

Thus

$I=4.5A$

Now,

$I_4=I_2-I_3$

$I_4=-1A$ -Ve means direction of current is going upwards .