# How can we obtain electric field lines using equipotential surfaces?

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Given the electric field lines, the equipotential lines can be drawn simply by making them perpendicular to the electric field lines. Conversely, given the equipotential lines, as in Figure 3a, the electric field lines can be drawn by making them perpendicular to the equipotentials, as in Figure 3b. Figure 2.

## How are electric field lines related to equipotential surfaces?

B. Electric field lines are always perpendicular to equipotential surfaces and point toward locations of lower potential. … Electric field lines are always perpendicular to equipotential surfaces and point toward locations of lower potential.

## How do you find electric field lines?

In vector calculus notation, the electric field is given by the negative of the gradient of the electric potential, E = −grad V. This expression specifies how the electric field is calculated at a given point. Since the field is a vector, it has both a direction and magnitude.

## Why electric field is normal to the equipotential surface?

An equipotential surface is circular in the two-dimensional. Since the electric field lines are directed radially away from the charge, hence they are opposite to the equipotential lines. Therefore, the electric field is perpendicular to the equipotential surface.

## How do you find the equipotential surface?

The equipotential surfaces of an electric dipole are shown in the figure since the distance of each point on a plane passing through the centre of the axis of the electric dipole is equal to the potential throughout the plane is zero. Hence it is over one possible equipotential surface.

## How are equipotentials measured?

(a) These equipotential lines might be measured with a voltmeter in a laboratory experiment. (b) The corresponding electric field lines are found by drawing them perpendicular to the equipotentials. Note that these fields are consistent with two equal negative charges. … The potential is zero far away from the charges.

## Where do electric field lines begin and end?

Lines begin and end only at charges (beginning at + charges, ending at – charges) or at Infinity. Lines are closer together where the field is stronger. Larger charges have more field lines beginning or ending on them. Electric Field lines never cross (since E must point in a definite direction unless it is zero).

## How do you find the distance between equipotential surfaces?

Distance between equipotential surfaces

1. Homework Statement. A non-conducting sphere (radius 11.3 cm) has uniform charge density ρ = 0.596 μC/m3. …
2. Homework Equations. V=kq/r. …
3. The Attempt at a Solution. ρ=0.596*106 C/m3 = Q/V ⇒ (0.596*106)=Q/(4/3*π*(0.113m)3)

## Why are electric field lines perpendicular to surfaces?

this is because there is no potential gradient along any direction parallel to the surface , and so no electric field parallel to the surface. This means that the electric lines of force are always at right angle to the equipotential surface.

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## What is true about the direction of the electric field lines and the equipotential lines?

Equipotential lines are always parallel to electric field lines. The number of field lines per unit area at a location is inversely proportional to the strength of the field at that location. Equipotential lines are always perpendicular to electric field lines.

## What is the angle between electric field lines and equipotential surface?

The angle between the electric field and the equipotential surface is always 90. The equipotential surface is always perpendicular to the electric field.

## Why are electric field lines perpendicular to the surface of a conductor Class 12?

So that the electrostatic field inside the conductor is zero. In the static situation, no excess charges will be present inside the conductor. … To get equipotential or constant potential throughout the surface, electrostatic field lines have to be perpendicular to the segments of the conductor.