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kondor19780726 [428]
3 years ago
12

Which statement describes what happens when a balloon is rubbed with a wool cloth?

Physics
2 answers:
victus00 [196]3 years ago
8 0
Electrons move from the atoms in the cloth to the atoms in the balloon, causing the balloon to have a negative charge

Hope this helps!!!
sladkih [1.3K]3 years ago
4 0
Yes, I just took this test, and can 100% confirm the correct answer to this question is e<span>lectrons move from the atoms in the cloth to the atoms in the balloon, causing the balloon to have a negative charge.

Hope this helps, and have a great day! :)</span>
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A ball with a mass of 170 g which contains 3.80×108 excess electrons is dropped into a vertical shaft with a height of 145 m . A
yaroslaw [1]

Answer:

A. F=6.65*10^{-10}N

B. south - north

Explanation:

A) We use the Lorentz force

F = qv X B

|F| = qvB

to calculate the magnitude of the force we need the speed of the of the ball.

v_{f}^{2}=v_{0}^{2}+2gy\\v_{f}=\sqrt{0+2(9.8\frac{m}{s^{2}})(145m)}=53.31\frac{m}{s}

and by replacing in the formula for the magnitude of the force we have (taking into account the excess of electrons)

F=(3.8*10^{8})(1.602*10^{-19}C)(53.31\frac{m}{s})(0.205T)=6.65*10^{-10}N

B)

b.  south - north (by the rigth hand rule)

I hope this is usefull for you

regards

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