Question

Alguém me ajudaaaaaaaaa urgente

Answer 1

1 Falta uma carga de elétrons igual a carga positiva que ele já tem:

$Q=ne\implies n=\dfrac{Q}{e} \implies n=\dfrac{12,8\cdot10^-^6}{1,6\cdot10^-^1^9} \implies n= 8\cdot10^-^1^3$

2

$F=\dfrac{K|Q_1||Q_2|}{d^2} =\dfrac{9\cdot10^9\cdot|-1,6\cdot10^-^1^9||1,6\cdot10^-^1^9|}{(5,3\cdot10^-^1^1)^2} \implies n= 8,22\cdot10^-^8N$

3 A.

4 D

$n=\dfrac{Q}{e}\implies n=\dfrac{4\cdot10^-^1^5}{1,6\cdot10^-^1^9}\implies n=2,5\cdot10^4$