Metal object is earthed by connecting it to

ii) Insulating materials that gain electrons when rubbed become negatively charged. c) An electric current is a flow of charge. d) An isolated metal object that is initially uncharged will gain charge if it is brought into contact with a charged object. e) A metal object is earthed by connecting it to the ground.

Explanation:

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the answer would be c. motion and direction

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this could be newton#'s law of cooling. the cooling curve is exponential