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# Electric Field Lines - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main

## Quick Facts

• Electric field lines is considered one of the most asked concept.

• 26 Questions around this concept.

## Solve by difficulty

A long cylindrical shell carries positive surface charge $\sigma$ in the upper half and negative surface charge$-\sigma$ in the lower half. The electric field lines around the cylinder will look like figure given in : (figures are schematic and not drawn to scale)

Charges are placed on the vertices of a square as shown. Let be the electric field and V the potential at the centre. If the  charges on  A and B  are  interchanged with those on  D and C espectively, then

The figure shows some of the electric field lines corresponding to an electric field. The figure suggests

Electric lines of force about negative point charge are

Three positive charges of equal value $q$ are placed at the vertices of an equilateral triangle. The resulting electric lines of force should be sketched as in

An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like

## Concepts Covered - 1

Electric field lines

Electric lines of force:

An electric field line is an imaginary line or curve drawn through a region of space so that its tangent at any point is in the direction of the electric field at that point.

Properties of Electric lines of force (Electric field lines):

i) Electric lines of force diverge out from positive charge and converge on the negative charge

ii) The number of field lines is proportional to the magnitude of charge

iii) Lines of force never cross or intersect each other. If they intersect at any point then at that point electric field intensity will have two directions which is not possible.

iv) Electric field lines do not form a closed loop. Since electric field lines cannot start and end on the same charge.

v) The tangent at a point on electric field lines will give the direction of the force on positively charged particle placed at that point.

vi) Electric field lines do not give the path of motion of the particle. It may show the path if electric field lines are straight.

vii) Electric field lines are normal to the conductor if it is starting from a conductor or while ending on the conductor.

viii) The uniform electric field is represented by straight, parallel, and equidistant lines.

ix) The electric field does not exist inside a conductor.

## Study it with Videos

Electric field lines

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