Question

URGENTE!!! Questão do terceiro ano do ensino médio.

Answer 1

$\vec E=\vec E_1+\vec E_2\\\\\vec E=K_0.\frac{q_1}{r_1^2} \hat r+K_0.\frac{q_2}{r_2^2} \hat r$

$\vec E=K_0.(\frac{q_1}{r_1^2} \hat r+\frac{q_2}{r_2^2} \hat r)\\\\\vec E=K_0.(\frac{4\mu}{0,2^2} +\frac{-5\mu}{0,3^2} )\hat r$

$\vec E=K_0.\mu(\frac{4}{0,2^2} +\frac{-5}{0,3^2} )\hat x$

$\vec E=K_0.\mu(100-55,6 )\hat x$

$\vec E=K_0.\mu(44,4 )\hat x$

$\vec E=9.10^9.10^-^6(44,4 )\hat x\\\\\vec E=399,6.10^3\hat x \ N.C^-^1\\\\\vec E=(4.10^5 \ N.C^-^1) \ \hat x$

resposta (a)