Question

If two point charges qi and q2 at some distance r attract each other with a force of 60N, what force would they exert on each other if r is increased fivefold (x5), qi is tripled (x3); and q2 is quartered (x1/4) and the signs of both charges are reversed. The two charges will

a. attract eachother with a force of 9N

b. repel eachother with a force of 9N

c. attract eachother with a force of 1.8N

d. repel eachpther with a force of 1.8N

e. attract eachother with a force of 2000N

Answer #1

Problem 1
Two charges are placed in an electric field a distance r from
each other. Charge q1 is positive while charge q2 is negative.
Select all possible changes that will double the electric force
between the two charges:
(a) change the sign of q2
(b) half the magnitude of q1 and half of r
(c) double the magnitude of q2 and take half of r
(d) take half of r
(e) double the magnitude of one of the charges...

Two-point charges, q1 = 25 nC and q2 = -75
nC are separated by a distance r = 3.0 cm. Find the force between
the two charges.

The drawing shows two point charges on the x axis. No other
charges are nearby. Given that the net electric field
E at location P, due to both charges, is 0 N/C, is
the sign of the charge q2 positive or negative?
Explain.
There are no forces involved in the explanation, so using words
like "attract" and "repel" is an indication that you're headed the
wrong way. Also, there are no charges at location P.
q1= +5nC

Two charges, q1 and q2, are located a
distance d apart and the each charge exerts on the other is F.
Charge q1 is doubled and charge q2 is doubled
and the separation between the charges is increased to 4d. The new
force each charge exerts on the other is _______.
a) 8F
b) 2F
c) F/8
d) 4F
e) F/4
f) F/2

Two positively charged objects repel each other with a force of
magnitude 180N when the distance between them is 15m. When the
distance between the same two objects is made 5m, the magnitude of
the force between them is
a 20N.
b 60N.
c 180N.
d 540N.
e 1620N.

1. Two point charges exert a 5.50 N force on each other. What
will the force (in N) become if the distance between them is
increased by a factor of 8?
2. A hydrogen atom contains a single electron that moves in a
circular orbit about a single proton. Assume the proton is
stationary, and the electron has a speed of
5.6 105 m/s. Find the radius between the
stationary proton and the electron orbit within the hydrogen
atom.

Two point charges are separated by a distance r. If the
separation is reduced by a factor of 10.2, by what factor does the
electric force between the two charges increase?

Two point charges are fixed 4.0 cm apart from each other. Their
charges are Q1=Q2 = 7.5 μC , and their masses are m1 = 1.5 mg and
m2 = 2.5 mg .If both charges are released from rest at the same
time, what will be the speed of Q1 after a very long time?

Two identically shaped conducting spheres, fixed in place,
attract each other with a force of 1.296 N when separated by 50 cm.
The spheres are connected by a thin wire and then the wire is
removed. The speheres then repel each other with a force of 0.729
N. What were the initial charges of the spheres.

1.4 [2pt] Consider two positive point charges Q at a distance 2
R from each other. Sketch electric field lines including their
direction.
1.4 ANSWER
1.5 [ 3pt] In problem 1.4, calculate electric fields (i) at a
distance R to the left of the left charge, (ii) at a distance R to
the right of the right charge, and (iii) at the mid-point between
the two charges. Assume Q = 1C and R = 1m.
1.5 ANSWER(s)
1.6 [3pt] Same...

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