(b) i. They are equal
ii. Twice as large
iii. Four times as large
iv. Half as largeSection 6 - Electric fields caused by multiple charges
6.1 Two charges, q 1 = í3.00 mC and q 2 = 4.50 mC, are located at í2.00 cm and 3.00 cm on the x axis, respectively. What are
the magnitude and direction of the resulting field at (a) x = í3.00 cm? (b) x = 0 cm? (c) x = 5.00 cm?
(a) N/C, i. to the right
ii. to the left
(b) N/C, i. to the right
ii. to the left
(c) N/C, i. to the right
ii. to the left6.2 A particle with charge +7.88 μC is placed at the fixed position x = 3.00 m in an electric field of uniform strength 300 N/C,
directed in the positive x direction. Find the position on the xaxis where the electric field strength of the resulting configuration
is zero.
m6.3 A particle with a charge of + 4.95eí3 C is placed on the y axis at y = 3.50 cm. Calculate the charge on a second particle,
placed at y = í2.00 m, that will result in a field whose strength at the origin is zero.
C
Section 7 - Drawing field diagrams for multiple charges
7.1 Two point charges of q and í 3 q located near each other create an electric field. If a correctly drawn diagram of the field
shows six field lines touching q, describe the electric field lines touching í 3 q.
Two lines going out of í 3 q
Two lines going into í 3 q
18 lines going out of í 3 q
18 lines going into í 3 q7.2 The illustration shows a diagram for the
electric field created by two charged particles,
q 1 and q 2. (a) Which charge is positive? (b)
Which charge is negative? (c) Which charge
has a greater magnitude? (d) How many times
greater is it?
(a) q 1 q 2 Neither Both
(b) q 1 q 2 Neither Both
(c) q 1 q 2
(d) times greater
7.3 The illustration shows a diagram for the
electric field created by three charged particles
q 1 ,q 2 and q 3. (a) Which charge(s) is/are
positive? (b) Which
charge(s) is/are negative? (c) List the charges
in order of increasing magnitude (disregarding
sign). (d) Charge q 1 is how many times
stronger than charge q 3?