# 2 physics questions

1)Two point charges, 3.0 ÂµC and -2.0 ÂµC, are placed 4.8 cm apart on the x axis, such that the -2.0 ÂµC charge is at x = 0 and the 3.0 ÂµC charge is at x = 4.8 cm.
(a) At what point(s) along the x axis is the electric field zero? (If there is no point where E = 0 in a region, enter “0” in that box.)

x < 0
cm

0 < x < 4.8 cm
cm

4.8 cm < x
cm

(b) At what point(s) along the
x axis is the potential zero? Let
V = 0 at
r = âˆž. (If there is no point where
V = 0 in a region, enter “0” in that box.)

x < 0
cm

0 < x < 4.8 cm
cm

4.8 cm < x
cm

2)A +5.5 ÂµC charge is 19 cm to the right of a -7.1 ÂµC charge.(a) At the midpoint between the two charges, what is the potential?
V
(b) At the midpoint between the two charges, what is the electric field? V/m

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