John uses the circuit as shown, to stimulate the traffic light for pedestrians. When the switch is closed, which of the light bulbs lights up?

When the switch is closed, current passes through the circuit and the solenoid behaves as an electromagnet; thus attracting the metal rod. In this condition, the other end of the metal rod gets connected to the terminal of green light bulb and the circuit gets completed. Hence, the green light bulb glows.

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