Two fixed charges -4.0 C and -5.0 C, are separated a certain distance.
a) Is the net electric field at a location halfway between the two charges:
1) directed toward the -4.0 C charge
2) Zero
3) directed toward the -5.0 C charge
b) If the charges are separated by 20 cm, calculate the magnitude of the net electric field halfway between the two charges.
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