How could I find the total electric field in this question?

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Homework Help Overview

The discussion revolves around calculating the total electric field resulting from a semicircular charge distribution and a point charge. The subject area is electrostatics, specifically focusing on electric fields generated by charge configurations.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the electric field due to a semicircular charge and question the validity of their calculations. There are attempts to relate the electric field contributions from different charge configurations and to check the correctness of their derived expressions.

Discussion Status

Some participants have provided expressions for the electric field and are seeking validation of their findings. There is an ongoing exploration of how to combine the electric fields from different sources, with some guidance offered on vector addition of fields.

Contextual Notes

Participants are encouraged to post their attempts in accordance with forum rules, indicating a collaborative environment focused on understanding rather than providing direct solutions.

Gnall
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Homework Statement
Hello. There is a semicircle charged ring and I found the electric field at the origin. But there is an also extra charge near the origin and the total electric field is zero. I need the charge. I'm trying to solve the 1-b question in the image.
Relevant Equations
Electric field.
The electric field due to the semicircle is 2kQ/pi.Rsquare
Sorry for the bad english.
 

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Gnall said:
The electric field due to the semicircle is 2kQ/pi.Rsquare
Sorry for the bad english.
Having solved a, b looks rather straightforward.
Please post an attempt as per forum rules.
 
I found that. Is that true?
 

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haruspex said:
Having solved a, b looks rather straightforward.
Please post an attempt as per forum rules.

Kq/aSquare=2kQ/piRsquare,
So q=2QaSquare/piRsquare
Is that true?
 
You already found the electric field at centre due to semicircular ring. Find the field due to point charge placed at distance 'a'. Check the directions and add them vectorially (basically just equate them:wink:).

P.S. You got the right answer.
 
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Aryamaan Thakur said:
You already found the electric field at centre due to semicircular ring. Find the field due to point charge placed at distance 'a'. Check the directions and add them vectorially (basically just equate them:wink:).

P.S. You got the right answer.
Thank you so much :)
 

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