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4.2.1 Electrical charge 1 2 3 State that there are positive and negative charges and that charge is measured in coulombs State that unlike charges attract and like charges repel Describe experiments to show electrostatic charging by friction 4 Explain that charging of solids by friction involves only a transfer of negative charge (electrons) 5 Describe an electric field as a region in which an electric charge experiences a force 6 7 State that the direction of an electric field line at a point is the direction of the force on a positive charge at that point Describe simple electric field patterns, including the direction of the field: (a) around a point charge (b) around a charged conducting sphere (c) between two oppositely charged parallel conducting plates (end effects will not be examined) 8 State examples of electrical conductors and insulators 9 Describe an exper
