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JEE · NEET Previous Year Question

$The angle between the vectors (i + j) and (j + k) is$

Topic: NEET PYQ

Answer: C. Full step-by-step solution below.

A $30°$
B $45°$
C $60°$
D $90°$

Correct answer: C

Solution

(c) (i + j) . (j + k) = 0 + 0 + 1 + 0 = 1 cos θ = \frac{A . B}{| A | | B |} = \frac{1}{2 \times 2} = \frac{1}{2} ∴ θ = 60°

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