If the moduli of a and b are equal and angle between them is \[{{120}^{o}}\] and \[\mathbf{a}\,.\,\mathbf{b}=-\,8,\] then | a | is equal to [RPET 1986]

If the moduli of a and b are equal and angle between them is \[{{120}^

1.	If the moduli of a and b are equal and angle between them is \[{{120}^{o}}\] and \[\mathbf{a}\,.\,\mathbf{b}=-\,8,\] then \| a \| is equal to [RPET 1986]
A.	? 5
B.	? 4
C.	4
D.	5
Answer» D. 5

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If the moduli of a and b are equal and angle between them is \[{{120}^{o}}\] and \[\mathbf{a}\,.\,\mathbf{b}=-\,8,\] then | a | is equal to [RPET 1986]

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