1.
If the vectors 2i+2j-k and 3i-6j+nk are
mutually perpendicular, find the value of n ?
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Answer:
● perpendicular means dot product
●parallel means cross product
●here both are perpendicular
● A•B = AB cos ø
● A•B =AB cos 90 ... (cos90=0)
● A•B = 0
☆ 2î +2j -k • 3î- 6j + nk=0
☆ 6 -12 - n = 0
☆ -6 =n
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