1) Positive charge.
V(a)=kq/a
q=V(a)a/k=(300)0.06/(9∙〖10〗^9 )=2∙〖10〗^(-9) C=2 nC.
2)
V(b)=V(a)-V(a->b)=kq/(a+x)
300-50=((2∙〖10〗^(-9))(9∙〖10〗^9))/(0.06+x)
x=0.012 m=1.2 cm.
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