A point charge is placed in an electric field which varies with location. No for

Question

A point charge is placed in an electric field which varies with location. No force is exerted on this charge: at locations where the electric field is zero at locations where the electric field strength is 1/(1.6 times 10^-19) N/C if the charge is moving along an electric field line if the charge is moving perpendicular to an electric field line if the electric field is produced by an equal amount of positive and negative Two point charges are arranged as shown as shown below. Where could a third charge, +1 C, be placed (other than at +/- infinity) so that the net electric force on it is zero? I only I and II only III only I and III only II only Two point charges q_1 and q_2 are placed a distance r apart. It is found that the electric field is zero at point P located somewhere between the charges along the line segment connecting them. Then: q_1 and q_2 must have the same magnitude and sign P must be exactly midway between q_1 and q_2 q_1 and q_2 must have the same sign but may have different magnitudes q_1 and q_2 must have equal magnitudes but opposite signs q_1 and q_2 must have opposite signs and may have different magnitudes

Explanation / Answer

4) Force experienced by the charge in an electric field is F = q*E

To get Fnet = 0 N

then

A) At locations where the electric field is zero

D) if the charge is moving perpendicular to an electric field line

E) if the electric field is produced by an equal amount of positive and negative charge

5) Since the two charges are oppositely signed and hence in between them the field never be zero

So in the regions I and III the force is zero

so the answer is D) I and III only

6) the two charges must have same signs and may have different magnitudes

C) is correct

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