Angle between the vectors ( i + j) and ( j - k) is ........ ^o - Vidyadip

MCQ

Angle between the vectors $(\hat i + \hat j)$ and $(\hat j - \hat k)$ is ........ $^o$

A
$90$
B
$0$
C
$180$
✓
$60$

✓

Answer

Correct option: D.

$60$

d
(d) $\cos \theta = \frac{{\vec A.\vec B}}{{|\vec A||\vec B|}} = \frac{1}{{\sqrt 2 \sqrt 2 }} = \frac{1}{2}$ $\theta = 60^\circ $

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