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q=1,2*10^-3 C
t=5min=60*5 s=300s
R=U/I
U=R*I
I=q/t
U=R*q/t=2kΩ*1/2*10^-3C/200s=2Ω*1/400 A= 1/200 V=0.05V
2.
U=?
W=UIT q=IT
U=W/q
q=5kC
W=2Mj
U=2Mj/5kC=2*1^6 j/5*10^3=4*10^2 V=400V