Each of the batteries shown in figure has an emf 5V. Prove that the magnetic field B at the point P is zero for any set of values of the resistances.
By applying Kirchhoff’s Voltage Law, we can observe that the current in the circuit is zero
Now, since net current in the circuit = 0
Induced magnetic field is always proportional to the current flowing in the circuit. Hence,
Net magnetic field 
at the point P=0
Induced magnetic field at point P is independent of the values of the various resistances in the electric circuit.
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