Help with understanding part of an integral

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In summary, an integral is a mathematical concept used to calculate the total value of a function within a given range by representing the area under a curve on a graph. To solve an integral, one must use integration techniques and have a good understanding of the function being integrated. Integrals have many applications in various fields and can be solved using different techniques. Common mistakes when solving integrals include forgetting to add the constant of integration, making errors in techniques or calculations, and not using the correct limits of integration. It is important to double-check work and practice to avoid these mistakes.
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Liquidxlax
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Homework Statement



RzS6g.png


Homework Equations





The Attempt at a Solution



The problem I'm having with this is that I'm not sure how the integral of (1/r)dr from 0 to R is

1/5R

I've had to solve this same problem 3 other ways which i got the end answer all 3 times. This way is just a little weird for me.






NEVER MIND, I was being stupid and forgot that r<R has a different electric field
 
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than r>R. So since the integral of E is 1/r, and when r=0 the electric field is infinity, the integral is ln(R).
 

FAQ: Help with understanding part of an integral

What is an integral?

An integral is a mathematical concept that represents the area under a curve on a graph. It is used to calculate the total value of a function within a given range.

How do I solve an integral?

To solve an integral, you need to use integration techniques such as substitution, integration by parts, or partial fractions. It is important to understand the properties of integrals and have a good understanding of the function being integrated.

What is the purpose of integrals?

Integrals have many applications in mathematics, physics, and engineering. They are used to find the area, volume, and other quantities in various mathematical models. They are also used in differential equations to solve problems in physics and engineering.

Can you provide an example of solving an integral?

For example, to solve the integral of 2x, you would use the power rule of integration and get x^2 + C as the final answer. To solve more complex integrals, you may need to use different techniques and multiple steps.

What are the common mistakes when solving integrals?

Some common mistakes when solving integrals include forgetting to add the constant of integration, making errors in integration techniques or calculations, and not using the correct limits of integration. It is important to double-check your work and practice solving integrals to avoid these mistakes.

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