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R
R
R
R
=
1/G
R
=
ρ·l / A
R
=
l / σ·A
G
G
G
G
=
1/R
G
=
A / ρ·l
G
=
σ·A / l
l
l
l
l
=
R· A/ ρ
l
=
σ·R·A
A
A
A
A
=
ρ·l / R
A
=
l / σ·R
ρ
ρ
ρ
ρ
=
R·A / l
ρ
=
A / G·l
σ
σ
σ
σ
=
l / R·A
σ
=
G·l / A
Interaction between charges (Coulomb's law): Charges, force, distance
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→
R
→
G
→
l
→
A
→
ρ
→
σ