Question

In the following network, the current flowing through $15ohm$ resistance is

• A. $0.8$A
• B. $1.0$A
• C. $1.2$A
• D. $1.4$A

Answer 1

The correct option is C $1.2$A

Here we see that:- $\frac{15}{3}=\frac{20}{4}$

Hence, the wheat-stone bridge is balanced, and no current flows through the galvanometer..

The equivalent circuit is shown:-

Now, the given circuit is in parallel connection of resistance with resistance along ABC =18 ohm and along ADC=24 ohm

Now, $i_1=\frac{24}{24+18}\times 2.1A$

$⟹i_1=1.2A$

Hence,current through 15 ohm resistor is $1.2A$.

Hence, answer is option-(C).