The electric field around an object is greater when the charge is more concentrated. The electric field strength E is proportional to the charge per unit area on the surface of a plate. The constant of proportionality is 1/ε0, where ε0 is called the permittivity of free space.
Permittivity of free Space - ε0
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Specification: Edexcel Physics (9PH0), A-level, Topic 7: Electric and Magnetic Fields, statements 109 and 113. Topic: Electric Fields.
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