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Hi, this is for reference only, not an answer.

When a bulb does not light up, is the electric circuit open or closed? 

If there are no visible gaps in the circuit, what could be the material which makes up its part – insulator of electricity or conductor of electricity?

Could the bulb light up if it is fused? 

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Setup 1 confirms L is a conductor.  M is either a non conductor or the bulb has blown.

Setup 2:  Putting a conductor L along the path and Q is still not lit => Q has blown.  Also confirms M is a non conductor.

OR….battery suddenly became totally drained….LOL!

 

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