The correct order from most to least effective in lighting the bulb is a closed circuit with a strong electromagnet, followed by a closed circuit with a weak electromagnet, and lastly an open circuit. Option (c) is the correct ranking.
To rank the arrangements and motions in terms of their effectiveness in lighting the bulb, we must understand that a closed circuit is required for current to flow and light a bulb. An open circuit means there is a break in the circuit, and no current flows. Between the two closed circuits, the one with a strong electromagnet will induce more current than a weak electromagnet, hence lighting the bulb brighter. Therefore, the arrangements, in order of most effective to least effective in lighting the bulb, are:
- Closed circuit with a strong electromagnet
- Closed circuit with a weak electromagnet
- Open circuit
This means that option (c) Closed circuit with a strong electromagnet, Open circuit is the correct ranking. Moreover, with a strong electromagnet, more electrons move in the coil, and a higher voltage is induced across the bulb, making it brighter as per Faraday's Law of Electromagnetic Induction.