Problem in electrostatics: E-field near 2 point charges

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Homework Help Overview

The discussion revolves around electrostatics, specifically the electric field near two point charges of unequal magnitudes. Participants are examining the implications of charge interactions and potential energy in relation to given options from an exam context.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the calculation of the electric field at a distance and the potential energy associated with the charges. There is uncertainty regarding the calculation of an angle and the validity of certain answer options based on the information provided.

Discussion Status

The discussion is ongoing, with participants questioning the necessity of calculating an angle to evaluate answer options. Some guidance has been offered regarding the disqualification of certain answers, but there is no explicit consensus on the correct options.

Contextual Notes

Participants reference an exam paper from the National Entrance Screening Test (NEST) conducted in India in 2016, which may impose specific constraints on the problem-solving approach.

ubergewehr273
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Homework Statement


Refer the image.

Homework Equations


kq1q2/r^2 = F
Potential energy = kq1q1/r

The Attempt at a Solution


Obviously since both charges are unequal in magnitude option a is incorrect.
Calculating field at large distance r,
E = kq1/r^2 - kq2/r^2
= kq2/r^2
Also potential energy at q1 is lesser than near q2 for negative charge.
So options c,d are correct. However I don't understand how the angle beta can be calculated from the given information.
 

Attachments

  • Screenshot-2018-5-26 master_A dvi - NEST2016_A pdf.png
    Screenshot-2018-5-26 master_A dvi - NEST2016_A pdf.png
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ubergewehr273 said:
However I don't understand how the angle beta can be calculated from the given information.
No need to calculate the angle to disqualify answer b.
 
Doc Al said:
No need to calculate the angle to disqualify answer b.
I'm sorry but I don't quite understand. The answers given are b,c,d.
 
Hmm. What book is this from?
 
Doc Al said:
Hmm. What book is this from?
It's from an exam paper called NEST (National Entrance Screening Test) conducted in India. Its for the year 2016.
 

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