Question

How strong is the attractive force between a glass rod with a +0.9 µC charge and...

How strong is the attractive force between a glass rod with a +0.9 µC charge and a silk cloth with a -0.5 µC charge, which are 15.0 cm apart, using the approximation that they act like point charges?

A.

0.26 N
B.

1.8x1011 N
C.

0.18 N
D.

0.027 N

Find the electric field at the location of qa using the figure below given that qb = qc = qd = +2.0 nC and q = -1.0 nC, and the square is 20.0 cm on a side?

A.

406.7 N/C

45o from -x axis
B.

449.5 N/C

60o from -x axis
C.

449.5 N/C

45o from -x axis
D.

406.7 N/C

60o from -x axis

help, please !!!

for Q 2 I can't upload the image

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