A) P only
B) P and Q only
C) Q and R only
D) P and R only
Correct Answer: D
Solution :
Since current in upper and lower arm of the square is same in case P and R only because effective resistance are same. Now magnetic field due to side of the square will be canceled in pair at the centre of the square in these two cases P and R.You need to login to perform this action.
You will be redirected in
3 sec