question_answer

Four wires of equal length and of resistances 10 ohms each are connected in the form of a square. The equivalent resistance between two opposite corners of the square is [NCERT 1977]

A)                    10 \[ohm\]

B)                                      40\[ohm\]

C)                    20\[ohm\]                     

D)            10/4\[ohm\]

Correct Answer: A

Solution :

             According to the problem, we arrange four resistance as follows Equivalent resistance \[=\frac{20\times 20}{40}=10\Omega \]