What is the direction of the electric field on -1 C due to +2 C charge?

Question

BlackTom AI · Accepted Answer

To analyze the direction of the electric field, recall that the field created by a positive charge radiates outward from the charge.
Option a: It points away from -1 C charge. This would imply the field originates from the negative test charge itself, which is not how a field is defined around other charges; the field at the location of the test charge is determined by the source charge, not by the test charge. This makes this choice incorrect.
Option b: It points toward -1 C charge. Since the source is a positive charge, the field does not point toward the negative test charge; the field lines emanate from the positive charge and move outward, so this direction is incorrect.
Option c: It points away from +2 C charge. Exactly: the +2 C charge emits field lines outward, so at any point in space the field points away from the +2 C source. This aligns with the fundamental rule for electric fields of positive sources, making this option correct.
Option d: It points toward +2 C charge. This would be true if the source were negative, but here the source is positive. Therefore this direction is incorrect.

UCIC 202503 PHYS101 Quiz 9

What is the direction of the electric field on -1 C due to +2 C charge?

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