φ = Ed
φ1 = kq/r1^2
φ2=kq/r2^2
U=φ1-φ2=kq(1/r1^2 - 1/r2^2) = 9*10^9 * 10^-8 (1/0.1 - 1/0.4) = 90*7.5=675 В
φ = Ed
φ1 = kq/r1^2
φ2=kq/r2^2
U=φ1-φ2=kq(1/r1^2 - 1/r2^2) = 9*10^9 * 10^-8 (1/0.1 - 1/0.4) = 90*7.5=675 В