Let $B_P$ and $B_Q$ be the magnetic field produced by the wire P and Q which are placed symmetrically in a rectangular loop ABCD as shown in figure. Current in wire P is I directed inward and in Q is 2I directed outwards. Values of line integral of magnetic induction for different segments of the loop ABCD are given as 

 $\underset{A}{\overset{B}{\int }}{\overrightarrow{B}}_Q.\overrightarrow{d}l=2{\mu }_0$
 $\underset{D}{\overset{A}{\int }}{\overrightarrow{B}}_P.\overrightarrow{d}l=-2{\mu }_0$ and $\underset{A}{\overset{B}{\int }}{\overrightarrow{B}}_P.\overrightarrow{d}l=-{\mu }_0$
 
 
The value of I will be