Ontario Grade 9 Science Class Practice Exam

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What is charging by induction?

Using a battery to charge an object
Charging a neutral object by bringing another charged object close to it without touching
Creating a charge through chemical means
Charging an object via a conductive material

The correct answer is: Charging a neutral object by bringing another charged object close to it without touching

Charging by induction refers to the process of transferring charge between two objects without them making physical contact. This is possible by bringing a charged object close to a neutral object, causing the charges in the neutral object to separate. This separation creates an electric field, causing opposite charges to be attracted and move towards each other. This results in the neutral object becoming charged, without the need of a battery or conductive material like options A and D. Charging through chemical means, as mentioned in option C, refers to electrochemical reactions, which is a different process from charging by induction.