# 8 questions (Essentials of physics)

8 questions of physics1
Use (10.1.1) with r = 0.01m. Were told that q1 = q2, so you can replace q2 by q1 and then
solve for q1.
2
Again use (10.1.1). You dont need to know the result of the last problem. We know
what the force at r = 0.01m is: F = 0.001N. Now we want to increase the distance to
rnew = 0.05m. To find out how this changes the force, form the ratio between the unknown
new force and the previous force:
Fnew =?
F
The charges q1 and q2 in the formula for Fnew and F are unchanged, so q1 and q2 cancel
in the ratio on the right-hand side. Only the ratio between r and rnew will appear  and
you know its value. You should get a force thats a lot smaller than F from problem 1.
3
Again use (10.1.1). The mass in kg isnt relevant to the answer.
4
Again use (10.1.1), making sure to use meters and not km for the distance r. Also state if
the force is force is attractive or repulsive.
5
Again use (10.1.1): solve for r.
7
Use (10.2.1)
10
Again use (10.2.1): solve for the field by dividing both sides by the charge (also specify the
direction of the field).
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ESSENTIALS OF PHYSICS, PHYS 102
HOMEWORK 1
DUE by 4:30 pm, Wednesday April 11, online through Canvas. If late (up to 24 hrs
maximum, 4:30 pm), score is reduced by 80%.
1 Textbook problems (10 points each):
1
Hints
1
Use (10.1.1) with r = 0.01m. Were told that q1 = q2 , so you can replace q2 by q1 and then
solve for q1 .
2
Again use (10.1.1). You dont need to know the result of the last problem. We know
what the force at r = 0.01m is: F = 0.001N. Now we want to increase the distance to
rnew = 0.05m. To find out how this changes the force, form the ratio between the unknown
new force and the previous force:
Fnew
=?
F
The charges q1 and q2 in the formula for Fnew and F are unchanged, so q1 and q2 cancel
in the ratio on the right-hand side. Only the ratio between r and rnew will appear  and
you know its value. You should get a force thats a lot smaller than F from problem 1.
3
Again use (10.1.1). The mass in kg isnt relevant to the answer.
4
Again use (10.1.1), making sure to use meters and not km for the distance r. Also state if
the force is force is attractive or repulsive.
5
Again use (10.1.1): solve for r.
7
Use (10.2.1)
10
Again use (10.2.1): solve for the field by dividing both sides by the charge (also specify the
direction of the field).
2

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