Объяснение:
E1=k*2*q/(4*a)²=k*q/(8*a²)
E2=E3=k*q/(8*a²)
E4=k*q/(4*a²)
E=E4+√(E2²+E3²) - E1=k*q/(4*a²) + k*q*√2/(8*a²) - k*q/(8*a²)=
=k*q*(1+√2)/(8*a²)≈0.3*k*q/a²
Объяснение:
E1=k*2*q/(4*a)²=k*q/(8*a²)
E2=E3=k*q/(8*a²)
E4=k*q/(4*a²)
E=E4+√(E2²+E3²) - E1=k*q/(4*a²) + k*q*√2/(8*a²) - k*q/(8*a²)=
=k*q*(1+√2)/(8*a²)≈0.3*k*q/a²