- #1
krbs
- 51
- 3
Homework Statement
A small sphere with charge 2.4 micro coulombs is suspended from a thread between 2 charged plates. The plates have a voltage of 62 and the distance between the plates is 3.1 cm. The sphere hangs at 18 degrees to the vertical.
Homework Equations
E = V/r
FE = Eq
Fnetx = FE - FT
Fnety = FTy - Fg
The Attempt at a Solution
[/B]
E = 62V/0.031m = 2000 N/C
FE = Eq = (2000 N/C)(2.3 x 10^-6 C)
FTx = FE = 4.6 x 10^-3 N
FTy = FE * tan18 degrees
= 4.6 x 10^-3 N * tan18
= 1.5 x 10^-3 N
Fg = mg
1.5 x 10^-3 N = m(9.8 m/s^2)
m = 1.5 x 10^-4 kg