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Let be three unit vectors, out of which vectors  and  are non-parallel. If  and  are the angles which vector  makes with vectors  and  respectively and , then | | is equal to:

(a)

60°

(b)

30°

(c)

90°

(d)

45°


Question ID - 57346 | Toppr Answer

Let be three unit vectors, out of which vectors  and  are non-parallel. If  and  are the angles which vector  makes with vectors  and  respectively and , then | | is equal to:

(a)

60°

(b)

30°

(c)

90°

(d)

45°

1 Answer - 5876 Votes

3537

Answer Key : (b) -

 (  – 

\because  are linearly independent

=0

(All given vectors are unit vectors)

 = 60° &  = 90°

∴ | | = 30°



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