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Physics
Physics
Problem
A simple pendulum of mass
m
m
m
charged negatively to
q
q
q
coulomb oscillates in a downward electric field
E
E
E
such that
m
g
>
q
E
mg > qE
m
g
>
q
E
. At equilibrium of the bob, the change in tension in the string will be (assuming rest condition) (1)
m
g
mg
m
g
(2)
q
E
qE
q
E
(3)
2
q
E
2qE
2
q
E
(4)
q
E
/
2
qE/2
q
E
/2
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