Gives
"V_s=\\frac{kQ}{r}"
Q charge distributed by surface
"V_s=10V"
Centr potential
"V_c=\\frac{kQ}{r}" Where r<R
Then "V_c=10V"
Electric field
"E_s=\\frac{Kq}{R^2}" Where R=r
"E_{in}=\\frac{kQr}{R^3}"
Centre electric field
Put value
r=0
"E_c=0"
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