question_answer

The equivalent resistance between points M and N is:

A)  \[2\,\Omega \]                          

B)  \[3\,\Omega \]

C)  \[2/3\,\Omega \]            

D)  None of these

Correct Answer: C

Solution :

When a battery is connected between point M and N. No current is found is PQO because for the path OQI, there is not net potential gap. Hence, this section may be removed from the circuit- \[\therefore \]      \[{{R}_{eff}}=\frac{2\times 1}{(2+1)}=\frac{2}{3}\Omega \]