if a=2i + j and b=λ j -3k . find λ --- a) if a is perpendicular to b ; b) a parallel to b
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a.b=λ
a.b=0 so
λ=0b=λ
b)if a parallel to b then
a.b=1
a.b=(2i+j).(λj-3k)
a.b=λ so
λ=1
Answer:
a) if a is perpendicular to b then a.b=,0
a.b=(2i+j).(λj-3k)
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