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Equation Sheet-1

# 0 1q electric field e 2 4 r12 force on a charge

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Unformatted text preview: elec = 2 4!" r12 ε is the permittivity of a material. The free space (vacuum) value of the permittivity is ε0 = 8.85×10 ­12 C2/Nm2. 1 = 9×109 Nm2/C2 4!" 0 1Q Electric field: E = 2 4!" r12 Force on a charge q in an electric field: Felec = qE Field approximation: Work field = qE !d qQ 4!" r qQ !PE = " 4#\$ r Work field = !V = !PE / q = " E !r Workagainst = !Work field = "PE = q"V Point charge approximation: !PE = " qE !d Workagainst Q 4#\$ r = !Work field = "PE = q"V !V = !PE / q = " qQ Q V (r ) = 4!" r 4!" r Q \$ 1 1' VA ! VB = ! 4"# & rA rB ) % ( PE (r ) = Electric Flux Φ = EA, where A is a surface area through which electric field lines travel, and E is the electric field component perpendicular to the surface A. If the electric field is oriented at an angle θ to the surface, then Φ = EAcosθ. Fo...
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