Question: how to Export plots

hello, 

i want to export Export plots to jpg, 

im using the following command (example of the idea) : 

>for i from 1 to 5 do 

fig:=plot(x*i,x=0..10):
Export("Fig.jpg", plot(sin), base = homedir):
od: 

how do i make the export aumaticly change the name of the distany file - like Fig[i] or somthing so it wont run it over each iteration. 
writing Fig[i] in the command does not work. 

thank you in advance 

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