Recitation ch 21
Answers at the end
Two point charges q1 and q2 lie along the x-axis.
q1 = + 16.0 micro-Coulombs is at x = 2.00 m and
q2 = + 9.00 micro-Coulombs is at the origin.
Where must a negative charge q3 be placed on
the x-axis such that the net electrostatic force
on it is zero ?
a x = + 1.14 m
b x = - 1.14 m
c x = + 0.857 m
d x = - 0.857 m
e x = + 2.86 m
As in figure (1), a charge Q is fixed at each of two opposite
corners of a square. A charge q is fixed at each of the other
two corners. If the resultant electrical force on Q is zero,
then Q and q are related as:`
a Q = - 2 Sqrt(2) q**2
b Q = q
c Q = - 2 Sqrt(2) q
d Q = q**2
e Q = - 4 q
Two fixed particles, of charges q1 = + 1.0*10**(-6) C and q2=
- 9.0*10**(-6) C, are 10 cm apart. How far from each should
a third charge be located so that no net electrostatic force
acts on it?
a 1 cm from q1 and 11 cm from q2.
b 5 cm from q1 and 15 cm from q2.
c 3 cm from q1 and 7 cm from q2.
d 1 cm from q1 and 9 cm from q2.
e 1.1 cm from q1 and 11.1 cm form q2.
Consider two identical conductor spheres, A and B.
Initially, sphere A has a charge of -80 Q and Sphere B
has a charge of +20 Q. If the spheres touched and then
are separated by a distance of 0.3 m, what is the
resultant force between them? [Take Q = 5.7*10**(-8) C]
a 0.2 N.
b 0.3 N.
c 0.4 N.
d 0.6 N.
e 0.9 N.
Charges q1 and q2 are on the x-axis. q1 is at x = a
and q2 is at x = 2a. The net force on a third charge
at the origin is zero.
Which of the following is TRUE ?
a q2 = -4*q1
b q2 = 2*q1
c q2 = -q1
d q2 = 4*q1
e q2 = -2*q1