In which of the following cases, the bulb will not glow when the switches are turned ON?
A
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B
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C
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D
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Solution
The correct option is A Materials that allow electric current to pass through them are called conductors.
Materials that do not allow electric current to pass through them are called insulators.
Metals like steel, gold, silver, copper, and aluminium, are good conductors of electricity.
Materials like rubber, diamond, dry wood, glass, and paper are bad conductors of electricity.
Since dry wood is a bad conductor of electricity, it will not allow electric current to flow in the circuit. Thus, the bulb will not glow.