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What kind of electric charge is acquired:  (a) by a glass rod rubbed with silk cloth?  (b) by a plastic comb rubbed with dry hair?

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What kind of electric charge is acquired: 

(a) by a glass rod rubbed with silk cloth? 

(b) by a plastic comb rubbed with dry hair?

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(a) After rubbing the glass rod with silk cloth, the glass rod becomes positively charged. The silk cloth becomes negatively charged. 

(b) The plastic comb acquires negative charge when it is rubbed with dry hair.

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