Static Electricity Points to keep in mind: a. b. c. Conductors cannot have static electricity. Static electricity needs an insulator When materials are rubbed against each other, electric charges are not created but only transfers electrons from one object to the other. Electrons move from high potential to low potential (i.e from high number to low number) 1. Draw appropriate charges on each material and show the transfer of charges after rubbing. Balloon Balloon Cloth Cloth Balloon and cloth before rubbing Balloon and cloth after rubbing 2. What happens if the balloon in stage 2 of Question 1 is in contact with a metal strip? Explain. Metal ............................................................................. Balloon ............................................................................ ............................................................................. ............................................................................ ............................................................................. ............................................................................ 3. Why a PC monitor is covered with dust? ...................................................................................................................................... 4. After gaining electrons from the cloth, can the polythene rod attract small pieces of paper? Explain. ............................................................................. ............................................................................ ............................................................................. 5. Complete the sentences below. a) The protons and neutrons make up the …………….. of the atom. …………….. move about in the space round the nucleus. An uncharged atom has equal numbers of …………….. and ……………... . b) A proton has a …………….. charge. An electron has an equal …………….. charge. A neutron is ……………... . c) Like charges ……………..; unlike charges ……………... . d) Insulating materials that lose electrons when rubbed become …………….. charged.
