Смотри чертеж:
AC²=l²+L²
AC²=3²+4³=25
AC = 5 m
E₁=k*q₁ / l² = 9*10⁹*1*10⁻⁷ / 3² = 100 V/m
E₂=k*q₂ / L² = 9*10⁹*2,5*10⁻⁶/ 5² = 900 V/m
Ex=E₂*cos a = 900*4/5 = 720 V/m
Ey = E₁+E₂*sin a = 100+900*3/5 = 640 V/m
Ea = √( Ex² + Ey²) = √ (720²+640²) ≈ 960 V/m
