Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Problem
Problem
Three identical charges are placed at corners of an equilateral triangle of side
l
l
l
. If force between any two charges is
F
F
F
, the work required to double the dimensions of triangle is (a)
−
3
F
l
-3 Fl
−
3
F
l
(b)
3
F
l
3 Fl
3
F
l
(c)
(
−
3
/
2
)
F
l
(-3/2) Fl
(
−
3/2
)
F
l
(d)
(
3
/
2
)
F
l
(3/2) Fl
(
3/2
)
F
l
Browse the problem library