Ask Questions, Get Answers

Want to ask us a question? Click here
Browse Questions
Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class12  >>  Current Electricity
0 votes

Thirteen resistors each of resistance R are connected in the circuit as shown. What sis the effective resistance between A and B?

$\begin {array} {1 1} (A)\;2R & \quad (B)\;\large\frac{4R}{3} \\ (C)\;\large\frac{2R}{3} & \quad (D)\;R \end {array}$


Can you answer this question?

1 Answer

0 votes
The potential difference across the central resistor is zero due to symmetry of the circuit.
The circuit can be treated like a balance wheatstone bridge with all the resistors
being the equivalent resistor of the small triangle configuration at the four corners.
Thus, the effective resistance is same as the resistance of a single unit triangle shaped
Hence, effective resistance =$\large\frac{ (R + R) \times (R)}{ ((R + R) + R)} = \large\frac{2R}{3}$


answered Feb 4, 2014 by thanvigandhi_1

Related questions

Ask Question
student study plans
JEE MAIN, CBSE, AIPMT Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App