Electric Charges and Fields

 

Key Equations

Coulomb’s lawF⃗ 12(r)=14πε0q1q2r212rˆ12
Superposition of electric forcesF⃗ (r)=14πε0Qi=1Nqir2irˆi
Electric force due to an electric fieldF⃗ =QE⃗ 
Electric field at point PE⃗ (P)14πε0i=1Nqir2irˆi
Field of an infinite wireE⃗ (z)=14πε02λzkˆ
Field of an infinite planeE⃗ =σ2ε0kˆ
Dipole momentp⃗ qd⃗ 
Torque on dipole in external E-fieldτ⃗ =p⃗ ×E⃗ 

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