When are the electric lines of force straight?

What are electric lines of force ?

When is electric line of force curved?

Sketch the electric lines of force due to point charges q < 0

Sketch the electric lines of force due to point charges q > 0

Electric field is the electrostatic force per unit charge acting on a vanishingly small test charge placed at that point. It is a vector quantity and the electric field inside a charged conductor is zero. Electric flux f is the total number of electric lines of force passing through a surface in a direction normal to the surface when the surface is placed inside the electric field The electric field at a point is

Electric field is the electrostatic force per unit charge acting on a vanishingly small test charge placed at that point. It is a vector quantity and the electric field inside a charged conductor is zero. Electric flux phi is the total number of electric lines of force passing through a surface in a direction normal to the surface when the surface is placed inside the electric field. phi=ointvecE.vec(ds)=q/epsilon_0 The electric field at a point is

If the number of electric lines of force emerging out of a closed surface are 10^3 , calculate the charge enclosed by the surface.