Question
Using Kirchhoff’s rules determine the value of unknown resistance R in the circuit so that no current flows through 4 resistance. Also find the potential difference between A and D.
Solution
Applying Kirchhoff's loop rule for loop ABEFA,
–9 + 6 + 4 × 0 + 2I = 0
I = 1.5 A … (i)
For loop BCDEB,
3 + IR + 4 × 0 – 6 = 0
Therefore, IR = 3
Putting the value of I from equation (i), we have
Potential difference between A and D through path ABCD,
