4 a)
Q = Charge = 50 x 10-12 C
r = distance from the charge = 2 cm = 0.02 m
Electric potential by the Charge at distance "r" is given as
V = k Q/r
inserting the values
V = (9 x 109) ( 50 x 10-12)/(0.02)
V = 22.5 Volts
b)
Electric field by the Charge at distance "r" is given as
E = k Q/r2
inserting the values
E = (9 x 109) ( 50 x 10-12)/(0.02)2
E = 1125 N/C
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