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: OCR Physics A (H556), A-level, 6.2.3 Uniform electric field. Topic: Electric Fields.
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All 17 lessons in Electric Fields · All OCR A-level Physics topics