A m$=20$gm$=20$g mass with charge q$=+8$Cq$=+8$C hangs from a spring of stiffness k$=50$N$/$mk$=50$N$/$m$.$ If an infinite plane with charge density $=+3$C$/$m$2$$=+3$C$/$m$2$ is placed d$=5$cmd$=5$cm below the masses original position, through what distance does the mass on the spring deflect in $$mm$?$ Ignore the sign of the deflection and answer with a positive number.