4.2.1 Electric charge

4.2.1.1—There are positive and negative

4.2.1.2—Positive charges repel other positive

4.2.1.3—Simple experiments to show the

4.2.1.4—Charging of solids by friction

4.2.1.5—An experiment to distinguish between

4.2.1.6—A simple electron model to explain the

4.2.1.7—Charge is measured in coulombs

4.2.1.8—An electric field as a region in which

4.2.1.9—Direction of an electric field at a

4.2.1.10—Simple electric field patterns

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4.2.1 Electric charge