2 Physics questions

1)Two point charges, 3.0 µC and -2.0 µC, are placed 4.8 cm apart on the x axis, such that the -2.0 µC charge is at x = 0 and the 3.0 µC 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 = ∞. (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 µC charge is 19 cm to the right of a -7.1 µC 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