Question

Determine a força que age entre duas cargas puntiformes, q1 = 150 nC e q2 =

100 nC, no vácuo, sendo 10 cm a distância entre elas (1 n = 10-9

, 1 cm = 10-2

).​

Answer 1

Lei de Coulomb :

F = k . $\frac{Q1 . Q2 }{d^{2} }$

F = ??

k = $9.10^{9}$

Q1 = 150 nC --> $150.10^{-9}$ C

Q2 = 100 nC ---> $100.10^{-9}$ C

d = 10 cm / 100 ---> 0,1 m --> $1.10^{-1}$

F = $9.10^{9}$ . $\frac{150.10^{-9} . 100.10^{-9} }{(1.10^{-1} )^{2} }$

F = $9.10^{9}$ . $\frac{(150 . 100 ).10^{(-9- 9)} }{1.10^{-2} }$

F = $9.10^{9}$ . $\frac{15000.10^{-18} }{1.^{-2} }$

F = $9.10^{9}$ . $15000.10^{-16}$

F = ( 9 . 15000 ).$10^{(9 - 16)}$

F = $135000.10^{-7}$

F =$1,35.10^{-2}$

F = 0,0135 N