SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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protons are transferred from the wool to the rod
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protons are transferred from the rod to the wool
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electrons are transferred from the rod to the wool
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electrons are transferred from the wool to the rod
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Detailed explanation-1: -When woolen cloth is rubbed against the plastic, both wood and plastic get electrified due to friction produced while rubbing. So, plastic has greater electron affinity (ability to attract electrons) as compared to wool, therefore, plastic acquires negative charge and wool acquires positive charge.
Detailed explanation-2: -When a rod is rubbed by wool, the rod becomes negatively charged while the wool becomes positively charged. This is because the electron in wool are less tightly bounded than electron in rod. So the friction between during rubbing makes the rod to gain electron from wool to rod.
Detailed explanation-3: -Thus, 1.7×10−18kg mass is transferred from wool to polythene.
Detailed explanation-4: -When a polythene rod is rubbed with a duster, the friction causes electrons to gain energy. Electrons gain enough energy to leave the atom and ‘rub off’ onto the polythene rod. The polythene rod has gained electrons, giving it a negative charge. The duster has lost electrons, giving it a positive charge.