Respostas

2013-08-08T11:53:03-03:00
5cm = 0,05m = 5*10^-2m

F=k*|Q²|/d²


202,5 = 9*10^9*|Q²| / (5*10^-2)²

202,5 = 9*10^9 * 10^4 * Q² / 25

202,5*25 = 9*10^13 * Q²

 5062,5 / 9*10^13 = Q²

5062,5 * 10^-13 / 9 = Q²

Q² = 562,5 * 10^-13
Q² = 5625 * 10^-1 * 10^-13

Q² = 5625 * 10^-14

Q = Raiz Quadrada de 5625 * 10^-14

Q = 75 *10^-7 C

Q = 7,5 * 10^-6 C

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Q = 7,5 uC 

uC = microCoulombs
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