Question

a, b are the magnitudes of vectors ā&b. If āxb=0 the value of a.b is
1) O
2) √ab
4) ab
3) a/b​

Answer 1

Answer:

4) a/b

Explanation:

a,b are the magnitudes of vectors a&b.if a×b=0 then the value of a,b is a/b

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Answer 2

Explanation:

a cross b= ab sin theta

a cross b=0

so sin theta=0 so theta=0

now a.b = ab cos theta

we know that theta =0

so ab cos 0= ab *1 = ab

so, correct option, is 4) ab