In the Fig. shown below each battery has emf $=5V$. Then the magnetic field at $P$ is:

Both ends of resistance ${\mathrm{R}}_1$​ are at same potential. Hence, current in ${\mathrm{R}}_1$​ is zero.
Both ends of resistance ${\mathrm{R}}_2$ are at same potential. Hence, current in ${\mathrm{R}}_2$​ is zero.
Both ends of resistance ${\mathrm{R}}_3$​ are at same potential. Hence, current in ${\mathrm{R}}_3$​ is zero.
Since current in the circuit is zero, magnetic field at P is zero.