In the given circuit the switch is replaced by a paper clip, silk thread, pencil lead, plastic scale
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paper clip : The current flows through it and the bulb glows
silk thread : The current does not flow through it as it is a insulator. The bulb does not glow
pencil lead : It has graphite in it . Graphite is a good conductor of electricity. The bulb glows
plastic scale : Bulb does not glow.
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