A tester is made with the two terminals of a battery connected to separate wires, each with one end free. A light bulb is also connected as a part of the circuit. Now an object is used to connect the free ends, and it is observed that the light bulb does not glow, in other words, there is no electricity flowing. Which of the following could be that object?

Copper wire

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A wooden stick

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A gold strip

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An iron strip

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Solution

The correct option is B
A wooden stick

Wood is a poor conductor of electricity and hence it does not allow electric current to flow through it easily. Therefore, owing to a lack of flow of current, the bulb doesn't glow. On the contrary, copper, iron and gold are good conductors of electricity and hence there would have been a flow of current in the circuit subsequently resulting in the glowing of the bulb.

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