1. E = Q/(4πεr²) Q1 = Q2 = 10⁻⁶ C
Q---<|>-->|<---Q
B A
- in pct. A r1 = 5cm =0,05m E1 = Q/(4πεr1²)
r2 = 3cm=0,03m E2 = Q/(4πεr2²) | Et(A)| = E2 - E1 = Q/(4πε) [1/r2² - 1/r1²]
sensul vectorului E (A) = sensul E2
- in B r1 = 3cm , r2 = 5cm | E(B) | = | E(A) | cu sensul E1