1-24-ElectricPotentialBB - Electric Field Lines The...

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The direction of electric field at any point is tangent to the field line passing through that point and in direction indicated by arrows on the field line. Electric Field Lines Electric field lines for a single point charge + - Lines are close together – strong field. Lines are far apart – weak field .
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Figure 19-15 Electric field lines for systems of charges The direction of electric field at any point is tangent to the field line passing through that point and in direction indicated by arrows on the field line. Lines are close together – strong field. Lines are far apart – weak field .
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A q E 0 ε = Electric Field inside a parallel plate capacitor ε 0 : permittivity of free space. ) /( 10 85 . 8 ) 4 /( 1 2 2 12 0 m N C k × = = - π ε m q m E F a 0 = = Constant acceleration – 1D kinematics equations 0 0 ε σ ε = = A q E Put a charge q 0 inside the capacitor: E F 0 q = + F F - Electric field inside is uniform, independent of location. Charge density, Charge per unit area
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After Electrostatic equilibrium is established, Electric Field Inside a Conductor: Shielding Only points on its surface can have net charge. The electric field is zero at any point inside a conductor. The electric field at the surface of the conductor is perpendicular to the surface.
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