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If either vector \(\vec{a} = \vec{0} \;or\; \vec{b} = \vec{0}\) then  \(\vec{a}\;.\vec{b} = \vec{0}\) But the converse need not be true. Justify your answer with an example. 

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i.e. neither \(\vec{i} = 0\) nor \(\vec{j} = 0\)

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