A point charge is a hypothetical object of negligible size. A 'test' charge is a point charge that does not affect the field it is in i.e. its own field is too small to change the field being measured.The electric field surrounding a point charge is radial. The equipotentials are concentric circles with the charge Q at the centre.The electric field strength due to a point charge Q is given by E = kQ/r2
Point Charges
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Specification: Edexcel Physics (9PH0), A-level, Topic 7: Electric and Magnetic Fields, statement 109. Topic: Electric Fields.
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All 17 lessons in Electric Fields · All Edexcel A-level Physics topics