Question

05- Uma carga pontual Q, positiva, gera no espaço um campo elétrico. Num ponto
P, a 0,5m dela, o campo tem intensidade E= 7,2.105 N/C. Sendo o meio vácuo
onde K0= 9.109 unidades S. I., determine Q.

Answer 1

$\displaystyle \underline{\text{Campo E{\'e}trico}}: \\\\\ \text E = \frac{\text{k}|\text q| }{\text d^2} \\\\ \underline{\text{temos}} : \\\\ \text E = 7,2.10^5 \ \text {N/C} \\\\ \text k = 9.10^{9}\ \text {N.m}^2/\text C^2 \\\\ \text d = 5.10^{-1} \ \text m \\\\\ \underline{\text{substituindo na f{\'o}rmula}}: \\\\ 7,2.10^5 = \frac{9.10^9\text Q}{(5.10^{-1})^2} \\\\\\ \text Q = \frac{7,2.10^{5}.25.0^{-2}}{9.10^9} \\\\\\ \text Q = 20.10^{(5-2-9)} \\\\ \huge\boxed{\text Q =2.10^{-5}\ \text{C}\ }\checkmark$