Resistance

R%20_%7BAB%7D%20%3D%20R_%7BAO%7D%20%5C%2C%20and%20%5C%2C%20R%20_%7BBC%7D%20%3D%20R_%7BOC%7D

so points O and B will be at same potential and hence, resistance

R_%7BOB%7D

becomes ineffective.
Similarly

R_%7BAO%7D%20%3D%20R_%7BAD%7D%20%5C%2C%20and%20%5C%2C%20R_%7BOC%7D%20%3D%20R_%7BDC%7D%2C

resistance

R_%7BOD%7D

becomes ineffective.
So, excluding

R_%7BBO%7D%20%5C%2C%20and%20%5C%2C%20R_%7BOD%7D

equivalent resistance

R_%7Beq%7D

of thegiven network between points A and C will be given by,

%5Cfrac%20%7B1%7D%7BR_%7Beq%7D%7D%20%3D%20%5Cfrac%20%7B1%7D%7B2R%7D%20%2B%20%5Cfrac%20%7B1%7D%7B2R%7D%20%2B%20%5Cfrac%20%7B1%7D%7B2R%7D

ie,

%5C%2C%20%5C%2C%20%5C%2C%20%5C%2C%20%5C%2C%20%5C%2C%20%5C%2C%20%5C%2C%20%5C%2C%20%7BR_%7Beq%7D%7D%20%3D%20%5Cfrac%20%7B2%7D%7B3%7DR

Chapter Questions
1 MCQs