The Electric Field

Friday, 10 August 2018

4:55 PM

﷐𝐸﷯=﷐﷐𝐹﷯﷮﷐𝑞﷮0﷯﷯ F - force felt by a positive charge of strength ﷐𝑞﷮0﷯ 𝐸=﷐﷮﷮𝑑𝐸﷯=﷐1﷮4𝜋﷐ϵ﷮0﷯﷯﷐﷮﷮﷐𝑑𝑞﷮﷐𝑟﷮2﷯﷯ ﷐𝑟﷯﷯ // To map a vector field, we can place a test particle at different points in space and observe their behaviour at those points // Positive to negative charge Number of electric field lines is proportional to the charge (density) they emerge from or terminate at Field line density = field strength Electric fields lines at any conducting surface is always perpendicular to the surface at electrostatic equilibrium Electric field lines never cross Positive charges travel parallel to field lines Negative charges travel anti-parallel (same direction, different sense) Draw a diagram See if any directions can be eliminated Electric Field for a Dipole Torque on a Dipole in an Electric Field Torque is zero at 0°, 180° Torque is maximum at 90°, 270° τ=−𝑝𝐸﷐sin﷮𝜃﷯ Potential Energy: −𝑝𝐸﷐cos﷮𝜃﷯ "Jar Rule" -> Anticlockwise // out of page

 

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