Physics Review Question

Unit: Electric
Year: 1992 Question#: 25
Question: Two equal charges, A and B, are positioned as shown below.

At which location is the electric field intensity due to these two charges equal to zero?

(1 ) A
(2 ) B
(3 ) X
(4 ) Y

What is this question really asking?




Explanation by: John L

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Answer 1
A

INCORRECT

A is on the edge, strong electric field. return to top























Answer 2
B

INCORRECT

B is on the edge, feeling strong field intensity. return to top

Answer 3
X
CORRECT

X is between the two positive charges, feeling a field intensity of zero because the force from one charge directly counteracts the force from the other charge. return to top

Answer 4
Y

INCORRECT

Y is on the far outer edge so it feels only a lop-sided charge. return to top

What's this question really asking?

Where is the force on a test charge zero? return to top