1.

If a vector 2i 3j 8k is perpendicular to the vector 2j 4i ak , then the value of a is :

Answer»

EXPLANATION:

SINCE it is perpendicular their product will be ZERO

therefore (2x2)i+(3x4)j+(8xa) k=0

4+12+8a= 0

8a=-16

a=-2

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