question_answer

In the following circuit reading of voltmeter V is

A) 12V                                       

B)  8V

C) 20V                                       

D) 16V

Correct Answer: A

Solution :

PD between X and Y is \[={{\mu }_{0}}\]and   PD . between  X  and   Z   is \[\frac{{{\mu }_{0}}i}{2\pi a}\] Now, we get potential difference between Y and Z i.e., reading of voltmeter is \[\frac{{{\mu }_{0}}i\sqrt{2}}{\pi a}\]