Electric Field due to a rod (1-dimensional)

AI Thread Summary
The discussion focuses on calculating the electric field at a specific point due to a charged rod. The individual expresses uncertainty about their choice of variables and the limits of integration in their solution. They seek feedback on their approach, indicating they are new to integrals and looking for guidance. There is a lack of responses, prompting them to consider sharing their solution for further assistance. Overall, the thread highlights the challenges faced by beginners in understanding electric fields and integration techniques.
thoff430
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Homework Statement



I am looking for the absolute value of the electric field at point A (see picture below) relative to the whole charged rod at the left side.

Homework Equations


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The Attempt at a Solution



I am not quite sure whether my choice for R and the boundaries of the integral are correct.
The solution seems to be legit at first sight, but as I'm just getting started with integrals, I would very thankful for any feedback or advice.

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Well, no one? Do I need to type out my solution? Thought it was okay to scan it.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
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Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
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