Find the net charge of a system consisting of each of the following. (b) 243 ele

Question

Find the net charge of a system consisting of each of the following.

(b) 243 electrons and 159 protons

Find the net charge of a system consisting of each of the following. (a) 5.93 x 10^6 electrons and 7.29 x 10^6 protons (b) 243 electrons and 159 protons 2- When adhesive tape is pulled from a dispenser, the detached tape acquires a positive charge and the remaining tape in the dispenser acquires a negative charge. If the tape pulled from the dispenser has 0.27 C of charge per centimeter, what length of tape must be pulled to transfer 4.8 x 10^13 electrons to the remaining tape?

Explanation / Answer

a) Qnet = Qe + Qp = ne*(-e) + np*e = (np-ne)*e = (+7.29e6-5.93e6)*1.6e-19

Qnet = 2.176e-13 C

b) Qnet = (159-243)*1.6e-19 = -1.344e-17 C

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2)

charge pulled Q = n*e = 4.8e13*1.6e-19 = 7.68e-6

length = 7.68e-6/0.27e-6 = 28.44 cm <-----answer

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