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Thursday, 2 March 2017

Electric Charges and Fields - II


An Electric Field Line:
It is a curve drawn in such a way that the tangent at each point on the curve gives the direction of electric field at that point.

Important Properties of Field Lines:
These are:
(i) Field lines are continuous curves without any breaks.
(ii) Two field lines cannot cross each other.
(iii)Electrostatic field lines start at positive charges and end at negative charges – they cannot form closed loops.

Electric Field at a Point due to Charge q:


Electric Field due to an Electric Dipole in its Equatorial Plane at a Distance r from the Centre:


Electric Field due to an Electric Dipole on the Axis at a Distance r from the Centre:


A Dipole Placed in Uniform Electric Field E experiences:


The Electric Flux:

Gauss’s Law:
The flux of electric field through any closed surface S is 1/ε0 times the total charge enclosed by S.
Electric field outside the charged shell is as though the total charge is concentrated at the centre. The same result is true for a solid sphere of uniform volume charge density.
The electric field is zero at all points inside a charged shell.

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