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## Homework Statement

## Homework Equations

charge density equations, electric field equations,

## The Attempt at a Solution

My attempts are attached. The attachment labeled A, is part A. Part B took a lot of paper so there are two attachments labeled B1 and B2. It is really B and C that I am struggling with. Not sure if I am on the right track or if it is correct. Any help would be much appreciated!

A little more thought: All the problems I have done in the back of my physics textbook are not like part B. I can find the electric field of a disk without a cut out in it. My thought process of finding the electric field with a cut out in it is integrating from the smaller radius to the larger radius. However, The total area of the washer is piR2^2-piR1^2. I plugged this result into my surface charge density toward the end of my solution.

My attempt at solution C:

Washer has charge +Q, Ring has radius 2R2, Lambda=Q/L

Clearly the charge on the ring has to be negative

therefore Lambda on ring is: -Q/4piR2

Thanks in advanced[/B]

#### Attachments

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