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To determine the charge of the electron
Negatively charged due to friction
E=VdE = \frac{V}{d}E=dV
EQ=mgEQ = mgEQ=mg or QVd=mg\frac{QV}{d} = mgdQV=mg
F=6πηrvF = 6\pi\eta r vF=6πηrv
6πηrv=mg6\pi\eta r v = mg6πηrv=mg
r=9ηv2ρgr = \sqrt{\frac{9\eta v}{2\rho g}}r=2ρg9ηv
Always multiples of 1.6×10−191.6 \times 10^{-19}1.6×10−19 C
1.6×10−191.6 \times 10^{-19}1.6×10−19 C
Electric charge is quantised
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