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Conduct an experiment to find out the presence of charge on a body. Make a small ball of thermocol. Collect thin silver foil used to decorate sweets. Wrap this thin silver foil to cover the thermocol ball and suspend it from a stand with the help of thread as shown in figure.Testing the presence of chargeBring a glass rod which is rubbed with a silk cloth near the suspended ball. a) What happens ? Does it get attracted towards the glass rod or move away from it?b) What do you observe?c) What could be the reason for this change in movement of the ball? |
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Answer» a) It will attracts towards glass rod. Now touch the silver foil on the thermocol ball with charged glass rod. Remove the glass rod from the ball and against rub it with silk cloth and bring it close to the suspended ball. b) The suspended ball moves away from the glass rod. c) In the above activity when a charged body brought near an uncharged body it induces an opposite charge in it and hence it get attracted by the glass rod. In the second case we have charged the thermocol by touching it with a charged glass rod. Hence when we brought the glass rod near the ball, as both of them have similar charge the ball gets repelled by the glass rod. From the above activity we can conclude that attraction is not a sure test to know the presence of charge on a body. |
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