Table of Contents

## What is a line of charge?

The electric field of a line of charge can be found by superposing the point charge fields of infinitesmal charge elements. The radial part of the field from a charge element is given by. The integral required to obtain the field expression is. Infinite line charge. Electric potential of finite line charge.

**When drawing electric field lines what determines the number of lines originating from a charge?**

The number of field lines originating or terminating at a charge is proportional to the magnitude of that charge. A charge of 2q will have twice as many lines as a charge of q. At every point in space, the field vector at that point is tangent to the field line at that same point.

**How do you find the charge of an electric field?**

Since we know the electric field strength and the charge in the field, the force on that charge can be calculated using the definition of electric field E=Fq E = F q rearranged to F = qE.

### What do equipotential lines represent?

Equipotential lines provide a quantitative way of viewing the electric potential in two dimensions. Every point on a given line is at the same potential. Such maps can be thought as topographic maps.

**What is line charge and point charge?**

Consider the electric field at a point some distance from, and directly above, a point charge Q. What happens to the field at the point if the point charge is spread uniformly over a horizontal line, as shown?

**What do electric field lines show?**

Electric field lines reveal information about the direction (and the strength) of an electric field within a region of space. If the lines cross each other at a given location, then there must be two distinctly different values of electric field with their own individual direction at that given location.

## What are electric field lines Class 12?

Electric field lines are a pictorial way of representing electric field around a configuration of charges. An electric field line is a curve drawn in such a way that the tangent to it at each point is in direction of the net field at that point.

**What is the direction of electric field lines?**

Electric field lines point away from positive charges and toward negative charges.

**What do equipotential lines do around a charge?**

The potential is the same along each equipotential line, meaning that no work is required to move a charge anywhere along one of those lines. Work is needed to move a charge from one equipotential line to another. Equipotential lines are perpendicular to electric field lines in every case.

### What are flow lines and equipotential lines?

Flow lines represent the path of flow along which the water will seep through the soil. Equipotential lines are formed by connecting the points of equal total head.

**How are charges related to the number of field lines?**

Field lines must begin on positive charges and terminate on negative charges, or at infinity in the hypothetical case of isolated charges. The number of field lines leaving a positive charge or entering a negative charge is proportional to the magnitude of the charge.

**What are the rules for electric field lines?**

The following rules apply to electric field lines: 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.

## How are electric fields different between multiple charges?

While the electric fields from multiple charges are more complex than those of single charges, some simple features are easily noticed. For example, the field is weaker between like charges, as shown by the lines being farther apart in that region.

**How to calculate the force of a charge?**

Calculate the total force (magnitude and direction) exerted on a test charge from more than one charge Describe an electric field diagram of a positive point charge; of a negative point charge with twice the magnitude of positive charge Draw the electric field lines between two points of the same charge; between two points of opposite charge.