Question

A student studies that an electroscope consists of two aluminium foils as shown in the image. When a charged body is brought near to the metal disc the aluminium foil strips responds to it. What causes the aluminium foil to respond to a charge body? Describe briefly the method of charging uncharged body by induction.

Answer 1

Answer:

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Answer 2

Response of aluminium foil to a charged body:

• Electroscope is a device used to identify whether a body is charged or uncharged.
• It consists of a metal rod. One end of the metal rod consists of aluminium foil and other end consists of a metal disc.
• When the charged body touches the metal disc, the aluminum leaves move away from each other.
• This action is aluminium leaves is due to the charge transfer to the leaves through the metal rod.
• The charge on the aluminium foil and the chargee body are similar. So they move away from each other.
• If uncharged bodies touch the rod, they don't repel each other.
• An uncharged body is placed very close to a charged conductor without touching each other.

Method of charging uncharged body by induction:

• The two bodies attract each other as the nearer end acquires a charge opposite to the charge on the charged conductor.
• There is no need for complete touch.

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