What is the magnitude of the force on the bead? What is the direction of the force on the bead?
A 10 cm long thin glass rod is uniformly charged to +50 nC. A small plastic bead, charged to – 5.0 nC, is 4.5 cm from the center of the rod.
λ = 50e-9 / 0.1= 5.e-7 C/m
E= λ/2πξo d = 5.e-7 / (2π8.854e-12*0.045)
199727.60973307147525146671105654
Force on the charge -5e-9 Cis
Eq = [5.e-7 / (2π8.854e-12*0.045)]* (-5e-9)
F = -9.99e-4 N
Minus sign shows that the force is attractive .
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