Observing that the bulb does not glow in the circuit shown in fig(A). Boojho changed the circuit as shown in the fig(B). He observed deflection in the magnetic compass. The deflection in the magnetic compass shows that [[1]] is flowing in the circuit.

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Detailed Solution

The deflection in the magnetic compass shows that the current is flowing in the circuit.
The compass needle is deflected in the presence of a current-carrying circuit because the current through the circuit creates a magnetic field around it. It is also deflected in the direction of the north on Earth due to the immense magnetism of the planet.The magnetic North Pole can be located with a compass.
Deflection in Magnetic compass depends upon the magnitude of current. The compass needle deflects due to magnetic effect produced by the electric current.

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