Q. 255.0( 1 Vote )

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.



Answer :

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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