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Physics
Physics
Problem
Three point charges are fixed on a straight line:
+
8
μ
C
+8\,\mu\text{C}
+
8
μ
C
at
x
=
0
x = 0
x
=
0
, an unknown charge
q
q
q
at
x
=
0.30
m
x = 0.30\ \text{m}
x
=
0.30
m
, and
+
2
μ
C
+2\,\mu\text{C}
+
2
μ
C
at
x
=
0.60
m
x = 0.60\ \text{m}
x
=
0.60
m
. What should be the value of
q
q
q
so that the net electrostatic force on the
+
2
μ
C
+2\,\mu\text{C}
+
2
μ
C
charge is zero? a)
−
4
μ
C
-4\,\mu\text{C}
−
4
μ
C
b)
+
2
μ
C
+2\,\mu\text{C}
+
2
μ
C
c)
−
2
μ
C
-2\,\mu\text{C}
−
2
μ
C
d)
−
1
μ
C
-1\,\mu\text{C}
−
1
μ
C
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