Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Physics
Physics
Problem
Four identical point charges, each of magnitude
+
q
+q
+
q
, are fixed at the corners of a square of side
a
a
a
. What is the electric potential at the midpoint of one of the sides of the square? a)
8
k
q
a
\dfrac{8kq}{a}
a
8
k
q
b)
4
k
q
a
(
1
−
1
5
)
\dfrac{4kq}{a}\left(1-\dfrac{1}{\sqrt{5}}\right)
a
4
k
q
(
1
−
5
1
)
c)
4
k
q
a
(
1
+
1
5
)
\dfrac{4kq}{a}\left(1+\dfrac{1}{\sqrt{5}}\right)
a
4
k
q
(
1
+
5
1
)
d)
2
k
q
a
(
1
+
1
5
)
\dfrac{2kq}{a}\left(1+\dfrac{1}{\sqrt{5}}\right)
a
2
k
q
(
1
+
5
1
)
Browse the problem library