A) \[\frac{1}{2}a\,(\widehat{k}-\widehat{i})\]
B) \[\frac{1}{2}a\,(\widehat{j}-\widehat{i})\]
C) \[\frac{1}{2}a\,(\widehat{j}-\widehat{k})\]
D) \[\frac{1}{2}a\,(\widehat{i}-\widehat{k})\]
Correct Answer: B
Solution :
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