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Electric Forces, Fields, and Voltage
(1) Find the net force at B:
(A) 2.00 μC
6.00 cm
(B) 3.00μC
6.00 cm
10.0 cm
(C) -5.00 μC
(2) Two point charges of 2.00 x 10-7 C and 8.50 x 10-8 C are 12.0 cm apart. (a)
What electric field does each produce at the site of the other? (b) What force
acts on each charge? (c) Where between them will the electric field be zero?
(3) Two equally charged objects 3.20 mm apart are released from rest. The
acceleration of the first particle is 7.00 ms-2 and the seconds is 9.00 ms-2. If the
mass of the first particle is 6.30 x 10-7 kg, (a) what is the mass of the second
particle? And (b) what is the common charge?
(4) Consider a point charge of 1.50 x 10-8 C. (a) what is the radius of an
equipotential surface having a potential of 30.0 V? (b) are equipotential surfaces
evenly spaced in radius?
(5) An electrostatic field of 1.00 x 10-5 NC-1 is pointing radially towards towards the
surface of the earth. If we wish to make a 0.00100 N balloon remain stationary in
the field, (a) what type of charges (protons or electrons) would have to be added
to the balloon and why? And (b) how many protons or electrons would have to be
added to the initially neutral balloon?
(6) An electron is shot from the positive plate towards the negative plate in a parallel
plate set-up with an initial speed of 1.00 x 106 cms-1. How large must the voltage
be across the plates if the electron is to stop just before it reaches the negative
(7) A -100. μC charge and a 200. μC charge are 10.0 m apart. Find the net electric
field intensity 6.00 m from the -100. μC charge on a line between the two
charges. If a test charge is placed at this position mentioned above and
experiences a force of 1.00 x 10-4 N, what is the size of the test charge?
(8) Points A and B are 20.0 cm apart on a line. There is a point charge of 3.00 μC at
A and -4.00 μC at B. (a) What is the voltage at point C which is 15.0 cm on the
other side of B? (b) What is the electric field intensity at point C? (c) How much
force would act on a 1.00 μC charge placed at point C? (c) How much work
would have to be done to move the 1.00 μC charge from position C to position D
which is 25.0 cm from B?
20.0 cm
15.0 cm
10.0 cm D