Question

Asupra unei sarcini electrice punctiforme de 240 nC ,care se afla intr-un punct al campului electrostatic,actioneaza o forta egala cu 0,84 mN .Ce forta va actiona asupra sarcinii de 420 nC introduse in acelasi punct al campului?

Answer 1

q1=240 nC=240•10^(-9) C

F1=0,84 mN=0,84•10^(-3) N

q2=420 nC=420•10^(-9) C

E=F1/q1=0,84•10^(-3)/240•10^(-9)=3500 N/C

E=F2/q2=>F2=Eq2=3500•420•10^(-9)=1,47•10^(-3) N=1,47 mN