mohon bantuannya para senior

a)Vb=kq/R
=9×10'9.6×10'-6/16×10'-2
=54×10'5/16
=3.375×10'4 V
b)Vb=kq/r
=9×10'9.6×10'-6/10×10'-2
=54×10'5/10
=54×10'4
mungkin sprti itu hehe