Electricity & Magnetism

Electric Field

E = \frac{F}{q} = k \frac{Q}{r ^{2}}

Electric field is force per unit charge.

Variables

E

Electric field

Field strength

N/C

F

Force

Force on test charge

N

q

Test charge

Small positive charge

C

Q

Source charge

Field-creating charge

C

r

Distance

From source

m

Derivation

E = F/q by definition. For point charge: E = kQ/r².

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