Electric Potential

[near quartz]

What Concept do we use in this question

[grand pebble]

<@&1227987967939838003>

Note for OP

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[eternal magnet]

sigma/2epsilon not E.F by sheet in both directions
meaning : E - Ef by sheet = 8 ; E + ef by sheet = 12
Uniform ef = 10
From this ef by sheet = 2 V/m = sigma / 2 epsilon not
sigma = 4 epsilon not so n ki value 4

[near quartz]

Ook

+solved @eternal magnet