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F

=

1 q1.q2 4πε r2

1 50*10-9.50*10-9 1.0 = 4π *8.85 *10−12 r2 1 50*10-9.50*10-9 r = 4π *8.85 *10−12 1.0 2

r2 = 2.25 *10−5 r = 4.74 *10−3 m or 4.74mm


Electrostatics