A piece of plastic has a net charge of +2.00 mewC. How many more protons than el

Question

A piece of plastic has a net charge of +2.00 mewC. How many more protons than electrons docs this piece of plastic have? (e = 1.60 times 10-19 C) 1.25 times 1013 1.25 times 1019 2.50 times 1013 2.50 times 1019 3.01 times 1023 If a charge generator builds a negative static charge of 7.00 mewC, how many electrons are transferred to it during this process. (e = 1.60 times 10-19 C) 4.38 times 1013 7.0 1.12 times 10-18 43.8 The force of attraction that a -40.0 mewC point charge exerts on a +108 mewC point charge has magnitude 4.00 N. How far apart are these two charges? (k = 1/4piepsilon0 = 8.99 times 109 N. m2/C2) Two 10pi coins (dimes) carrying identical charges are lying 2.5 m apart on a table. If each of these coins experiences an electrostatic force of magnitude 2.0 N due to the other coin, how large is the charge on each coin? (k = 1/4piepsilon0 = 9.0 times 109 N. m2/C2)

Explanation / Answer

4) A)1.25*10^13

no of more protons than electron, N = Q/e

= +2*10^-6/(1.6*10^-19)

= 1.25*10^13

5) A)4.38*10^13

no of more electron, N = Q/e

= -7*10^-6/(-1.6*10^-19)

= 4.38*10^13

6) C) 3.12 m

Apply, F = k*q1*q2/d^2

d^2 = k*q1*q2/F

d = sqrt(k*q1*q2/F)

= sqrt(9*10^9*40*10^-6*108*10^-6/4)

= 3.12 m

7)

Apply, F = k*q1*q2/d^2

F = k*q^2/d^2

q^2 = F*d^2/k

q = d*sqrt(F/k)

= 2.5*sqrt(2/(9*10^9))

= 37 micro C

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