A small glass bead has been charged to + 25 nC . A tiny ball bearing 2.0 cm above the bead feels a 1.8×10−2 N downward electric force.
What is the charge on the ball bearing?
Express your answer in nanocoulombs.
F = kQ₁Q₂/r²
0.018 = 9e9(25n)(Q) / 0.02²
Q = (0.02²)(0.018) / (9e9)(25e-9)
Q = 3.2e-8 = 32 nC (ans)
[If sign is also needed, then put a negative sign]
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