Short Note

Each of the batteries shown in figure has an emf equal to 5 V. Show that the magnetic field B at the point P is zero for any set of values of the resistances.

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#### Solution

By appluing Kirchoff voltagee law,we can see that the current in the circuit is zero.

Net current in the circuit = 0

As

magnetic field is always proportional to the current flowing in the circuit hence,

Net magnetic field at point P = 0

Field at point P is independent of the values of the resistances in the circuit.

Concept: Magnetic Force

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