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$*14$ Consider a particle with charge $q=1\mathrm{.}0C,$ point $A$ at distance $d_1=2\mathrm{.}0m$ from $q,$ and point $B$ at distance $d_2=1\mathrm{.}0m.($a$)$ If A and $B$ are diametrically opposite each other, as in Fig. $24-36$a$,$ what is the electric potential difference $V_A-V_B?($b$)$ What is that electric potential difference if A and $B$ are located as in Fig. $24-36$b$?$

$($a$)$

$($b$)$

Figure $24-36$ Problem $14.$