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प्रश्न
Which of the following methods can be used to charge a metal sphere positively without touching it? Select the most appropriate.
पर्याय
Connect the positive terminal of a battery and float the other end of the battery.
Rub it with a piece of silk.
Rub it with a piece of fur.
Bring a negatively charged rod near the sphere and touch it to ground for a short while.
उत्तर
Bring a negatively charged rod near the sphere and touch it to ground for a short while.
Explanation:
This can be accomplished through induction; if a negative charge rod is placed near the sphere (at a distance that is not in contact), it attracts positive charge inside the sphere to one side and collects negative charges on the other; when the sphere's surface is connected to the earth, the negative charge goes to the earth and the sphere remains positively charged.
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