Question

ALGUÉM ME AJUDA POR FAVOR! OBS: ANEXO!!!

Answer 1

Resposta:

Explicação:

1)

$E = \frac{F}{Q} \\E = \frac{8}{4.10^{-6} } \\E =2. 10^{6} N/C \\E = 2 M N/C\\(B)$

2)

$E = K \frac{Q}{d^{2} } \\E = 9 . 10^{9} \frac{4 . 10^{-6} }{(0,6)^2} \\E = \frac{36 . 10^{3} }{0,36} \\E = 100 . 10^3 N/C\\E = 100 K N/C\\(A)$

3)

$E = K \frac{Q}{d^{2} } \\9 . 10^{-1} = 9 . 10^{9} \frac{400.10^{-12} }{d^2} \\d^2 = \frac{3600.10^{-3} }{9.10^{-1} } \\d^2 = 400. 10^{-2} \\d = \sqrt{400. 10^{-2} } \\d= 20.10^{-1} \\d = 2 m\\(B)$

4)

$E = K \frac{Q}{d^2} \\7,2.10^{9} = 9.10^{9} \frac{Q}{(0,5)^2} \\7,2.10^{9} = 9.10^{9} \frac{Q}{0,25} \\Q = \frac{7,2.10^{9}.0,25}{9.10^{9} } \\Q = 0,8 . 0,25 \\Q= 0,2 C\\(B)$