A uniform electric field of 100 V/m is directed at $30^{0}$ with the +ve x - axis as shown in figure . Find the potential difference $\;V_{BA}\;$ if OA=2 m and OB= 4 m

Question

$(a)\;100\;(2+\sqrt{3})\qquad(b)\;-100\;(2+\sqrt{3})\qquad(c)\;100\;\sqrt{3}\qquad(d)\;-200$