In Figure you find that the bulb glows when an iron nail is placed between two ends of the wire. Complete the following sentences on the basis of this fact.
(a) __________is a metal.
(b) Metals are good_________ of electricity.
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Solution
(a) Iron is a metal.
(b) Metals are good conductors electricity.
Iron being a metal allows the electricity to pass through it, which implies that metals are good conductors of electricity.