- #1
mikep
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Can someone please help me with this question?
Two point charges lie on the x axis. A charge of + 3.5 µC is at the origin, and a charge of -3.5 µC is at x = 10.0 cm. What is the net electric field at x = -2.0 cm? What is the net electric field at x = + 2.0 cm?
for the first one i did
[tex]k q/r^2[/tex]
[tex](9 x 10^9) (3.5 x 10^-6)/(0.02m)^2 = 78750000 N/C[/tex]
[tex](9 x 10^9) (-3.5 x 10^-6)/(0.12m)^2 = -2187500[/tex]
[tex]78750000 - 2187500 = 76562500N/C[/tex]
can someone please tell me what I'm doing wrong?
Two point charges lie on the x axis. A charge of + 3.5 µC is at the origin, and a charge of -3.5 µC is at x = 10.0 cm. What is the net electric field at x = -2.0 cm? What is the net electric field at x = + 2.0 cm?
for the first one i did
[tex]k q/r^2[/tex]
[tex](9 x 10^9) (3.5 x 10^-6)/(0.02m)^2 = 78750000 N/C[/tex]
[tex](9 x 10^9) (-3.5 x 10^-6)/(0.12m)^2 = -2187500[/tex]
[tex]78750000 - 2187500 = 76562500N/C[/tex]
can someone please tell me what I'm doing wrong?