On a cold, dry day, a child takes two balloons and rubs them against his sweater.
(a) When taken near each other, the balloons repel each other.
(b) When one is taken near the wall, it sticks to it.
Give reasons for the above observations.

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Solution

(a) The balloons acquire the same kind of charge on rubbing, so they repel each other.

(b) When a charged balloon is brought near an uncharged wall, induction occurs, and the wall acquires a charge opposite to that of the balloon. As the balloon and the wall now have opposite charges, they are attracted to each other.

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On a cold, dry day, a child takes two balloons and rubs them against his sweater. (a) When taken near each other, the balloons repel each other. (b) When one is taken near the wall, it sticks to it. Give reasons for the above observations.

On a cold, dry day, a child takes two balloons and rubs them against his sweater.
(a) When taken near each other, the balloons repel each other.
(b) When one is taken near the wall, it sticks to it.
Give reasons for the above observations.