1.Two particles are given electrostatic charges Q 1 and Q 2 . They are separated

Question

1.Two particles are given electrostatic charges Q1 and Q2. They are separated by a distance D, and the force is measured to be F0. For each of the following situations below, some things about the system are changed, and the objects exert a new force on each other F1. Determine this new force F1in terms of F0 (see [a] for an example.)

a.Q1 is halved, Q2 & D are unchanged   (Answer: F1 = F0 / 2)

b.Q1 is doubled, Q2 is halved, and D is unchanged

c.Q1 and Q2 are unchanged, D is halved

d.Q1 is unchanged, Q2 & D are both doubled

e.Q1 , Q2 and D are all tripled

f.Q1 is tripled, Q2 is halved, D is tripled

g.Q1 is increased by a factor of 12, Q2 is reduced by a factor of 3, D is doubled

h.Q1 is doubled, Q2 is reduced by a factor of 4, D is halved

Explanation / Answer

Given F0 = k*Q1*Q2 / (D2)

a) F1 = F0 /2.

b) F1 = F0

c) F1 =4*F0

d) F1 = F0 / 4

e) F1 = F0

f) F1 = F0 / 6

g) F1 = F0

h) F1 = 2*F0

All the values are expressed in terms of F0.

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