JEE Mathematics Online Test Vector Algebra Set B

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Question 1

Question

Let a and b be two non-collinear unit vectors. If u = a - (a . b) b and v = a × b, then | v | is
(1) | u |                 (2) | u | + | u . a |
(3) | u | + | u . b | (4) | u | + u.(a + b)

Answer
1, 2 and 3 are correct
2 and 4 are correct
1 and 2 are correct
1 and 3 are correct