# Answer to Question #69781 in Other Physics for JItender

Question #69781

1. a) Obtain a unit vector perpendicular to the plane of the vectors

A i j k B i j kˆ 3

ˆ ˆ and ˆ 2

ˆ 4

ˆ = 3 − + = + +

r r

. (5)

b) For any four vectors a

r

,b

r

, c

r

and d

r

determine:

(a b)(c d) (b c)(a d) (c a)(b d)

r r r r r r r r r r r r

× . × + × . × + × . × .

A i j k B i j kˆ 3

ˆ ˆ and ˆ 2

ˆ 4

ˆ = 3 − + = + +

r r

. (5)

b) For any four vectors a

r

,b

r

, c

r

and d

r

determine:

(a b)(c d) (b c)(a d) (c a)(b d)

r r r r r r r r r r r r

× . × + × . × + × . × .

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