In the future people will only enjoy one sport: Electrodisc. In this sport you g

Question

In the future people will only enjoy one sport: Electrodisc. In this sport you gain points when you cause metallic discs hovering on a field to exchange charge. You are an Electrodisc player playing the popular four disc variant. The disks have charges of qA = 8.0 µC, qB = 2.0 µC, qC = +5.0 µC, and qD = +12.0 µC.

(a) You bring two disks together and then separate them. You measure the resulting charge of these two disks and find that it is +8.5 µC per disk. Which two disks did you bring together?

A and B

A and C    

A and D

B and C

B and D

C and D

(b) You bring three disks together and then separate them. You measure the resulting charge of these three disks and find that it is +5.0 µC per disk. Which three disks did you bring together?

A, B, and C

A, B, and D    

A, C, and D

B, C, and D

(c) Given the resulting charge of each disk measured in (b) is +5.0 µC,

how many electrons would you need to add to a disk of this charge to electrically neutralize it?

=____ electrons

Explanation / Answer

a)

C and D

charge on each disc is Qc+Qd/2 = 8.5uc

b)

B, C, and D

charge on each disc = Qb+Qc+Qd/3 = 5 uC

c)

charge to nuetralise = -5.0 uC

charge of one electron = -1.6x10^-19 C

n x -1.6x10^-19 C = 5 x 10^-6 C

n = 3.125 x 1013 electrons ( answer )

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