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Is C the Correct Choice for Electroscope Question?
- Thread starter Miike012
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The discussion revolves around the correct answer to an electroscope question, with an initial suggestion that the answer is C due to polarization causing negative charge to repel the leaves. However, it is clarified that C is only correct if the negative rod's charge significantly exceeds that of the positive rod. The participants agree that the leaves have a pre-existing positive charge, leading to the conclusion that the correct answer is A. There is consensus that while the leaves will experience some repulsion, it will not be as strong as initially suggested. The final agreement reinforces the importance of considering the existing charge on the leaves in determining the correct answer.
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SammyS
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Miike012 said:
The answer C is not correct unless the charge on the negative rod is significantly greater in magnitude than the charge on the positive rod.
The explanation regarding polarization is somewhat correct, but remember, the leaves have a pre-existing positive charge.
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Miike012
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I believe it would have to be A then. I think the leaves will still have a slight repulsion but not as much...
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SammyS
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I agree.Miike012 said:
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...
In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question.
Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point?
Lets call the point which connects the string and rod as P.
Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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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