# Blog

## What does a line integral tell us?

A line integral allows for the calculation of the area of a surface in three dimensions. ... Or, in classical mechanics, they can be used to calculate the work done on a mass m moving in a gravitational field. Both of these problems can be solved via a generalized vector equation.

## Where is line integral used?

A line integral is used to calculate the mass of wire. It helps to calculate the moment of inertia and centre of mass of wire. It is used in Ampere's Law to compute the magnetic field around a conductor. In Faraday's Law of Magnetic Induction, a line integral helps to determine the voltage generated in a loop.

## Can a line integral be zero?

Showing that the line integral along closed curves of conservative vector fields is zero. Created by Sal Khan.

## What is line integral and surface integral?

A line integral is an integral where the function to be integrated is evaluated along a curve and a surface integral is a generalization of multiple integrals to integration over surfaces. ... Surface integrals have applications in physics, particularly with the theories of classical electromagnetism.Nov 25, 2021

## How do you solve a line integral?

Evaluating Line Integrals

Fortunately, there is an easier way to find the line integral when the curve is given parametrically or as a vector valued function. We will explain how this is done for curves in R2; the case for R3 is similar. ds=||r′(t)||dt=√(x′(t))2+(y′(t))2.
Jul 25, 2021

## Who invented line integrals?

Introduction to the Line Integral. Created by Sal Khan.

## What is the difference between definite and line integral?

Line integrals has a continuously varying value along that line. Definite integrals express as the difference between the value of the integral at specified appear and lower limit of the independent variable.

## What's the difference between a line integral and a contour integral?

A contour integral is a line integral over a closed curve in the complex plane. A contour integral is usually represented using the symbol. Line integrals are integrals whose integrand is to be evaluated along a curve. Line integrals can be over curves within the complex plane or within the real plane.

## What is called line integral?

In mathematics, a line integral is an integral where the function to be integrated is evaluated along a curve. The terms path integral, curve integral, and curvilinear integral are also used; contour integral is used as well, although that is typically reserved for line integrals in the complex plane.

### Why is a line integral 0?

You can interpret the line integral being zero to have some special meaning: ... If we now move the object along a given path and the path integral is zero, then we didn't need to use any work to do it, i.e. we didn't need to work against the force field.Jan 24, 2016

### Can a line integral be negative?

If the integral is positive, you will arrive in Atlanta early, if the integral is negative you will arrive late. This sort of integral is called a line integral or path integral because we are integrating along a line or a path.

### What is Green theorem in calculus?

In vector calculus, Green's theorem relates a line integral around a simple closed curve C to a double integral over the plane region D bounded by C. It is the two-dimensional special case of Stokes' theorem.

### What is a line integral and what is it used for?

• A line integral gives us the ability to integrate multivariable functions and vector fields over arbitrary curves in a plane or in space. There are two types of line integrals: scalar line integrals and vector line integrals. Scalar line integrals are integrals of a scalar function over a curve in a plane or in space.

### What is the relationship between line integrals and vector fields?

• And, they are closely connected to the properties of vector fields, as we shall see. A line integral gives us the ability to integrate multivariable functions and vector fields over arbitrary curves in a plane or in space. There are two types of line integrals: scalar line integrals and vector line integrals.

### Does the line integral depend on the parameterization of the curve?

• As long as the curve is traversed exactly once by the parameterization, the area of the sheet formed by the function and the curve is the same. This same kind of geometric argument can be extended to show that the line integral of a three-variable function over a curve in space does not depend on the parameterization of the curve.

### How do you find the scalar line integral of a function?

• Let f be a function with a domain that includes the smooth curve C that is parameterized by ⇀ r(t) = ⟨x(t), y(t), z(t)⟩, a ≤ t ≤ b. The scalar line integral of f along C is if this limit exists t ∗ i and Δsi are defined as in the previous paragraphs).