Electrostatics and Electric Fields (4C)
MCAT · Flashcards · Application
MCAT · FLASHCARDS
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QUESTION
How does the electrostatic force magnitude change if the separation doubles:
r
→
2
r
r \to 2r
r
→
2
r
?
QUESTION
Identify the sign of
Δ
U
\Delta U
Δ
U
when a positive charge moves in the direction of
E
⃗
\vec{E}
E
.
QUESTION
Find the net electric field at the midpoint between charges
+
Q
+Q
+
Q
and
−
Q
-Q
−
Q
separated by
2
d
2d
2
d
(direction only).
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ANSWER
Toward the
−
Q
-Q
−
Q
charge (from
+
Q
+Q
+
Q
to
−
Q
-Q
−
Q
). Fields from opposite charges at the midpoint add constructively, pointing towards the negative charge.
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