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Answer:
b. P only
Explanation:
This is because,
In circuit Q - There are two bulbs but there is no source of energy that is , there is no cell or battery.
Hence bulb will not glow in circuit Q.
In circuit R - There is a battery but in the bulb the filament is broken .
Hence bulb will not glow in circuit R .
BUT,
In circuit P - there is a source of energy, switch is kept on and the bulb filament is not broken.
Hence, bulb will glow in circuit P.(Ans)