The methods to infer that something is flowing through the wires.
Answer to Problem 1CQ
Place a compass needle near the circuit as a result it will show deflections as current flows through the circuit. Otherwise use charged glass or plastic rod to prove that charge is not accumulated.
Explanation of Solution
One of the simple method is to place a compass needle near to the circuit, if the circuit is complete a current will flow through it, and associated with the current the will be a magnetic field. The magnetic field results in the deflection of compass needle, along the direction of magnetic field created by the current. The direction of deflection changes as current changes its direction.
Due to the flow of current light will emerge from bulb, and filament will emit heat. Another method is to use charges glass and plastic rod to check whether the charge is accumulated at the light bulb.
If there is a deflection in compass needle, and emission of light and heat from bulb, energy is somehow transferred from battery to bulb, and there is something to carry the energy. Thus, with these evidences it can be concluded that the charges flow through wires.
Conclusion:
The deflection of compass needle, and light emission from bulb indicated that there are charges which flow through the wire.
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Chapter 22 Solutions
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