Two semi-infinite wires and one infinite wire are arranged as shown in figure. At point 0, the wires are electrically insulated from each other. Wire I & II carry same current I in the direction shown in figure. Two points P & Q are marked such that $OP = OQ = d$. Mark the correct statement (s) for this situation.

 

Magnetic field at P & Q would be equal in magnitude when direction of current in III is from B to A.

Magnetic field at P & Q would be always equal in magnitude

Magnitude of magnetic field at P & Q would never be equal, whatever be the value of current in III rd wire.

The magnetic field at P & Q would be equal and opposite for all values of current flowing through III wire, when direction of current in III wire is from A to B.