Question

.Find the scalar product of two vectors. A = (3i ˆ – 4jˆ + 5kˆ ) and B = (– 2i ˆ + jˆ – 3kˆ)

(a) -15

(b)-25

(c) 25

(d) 15.​

Answer 1

Answer:

A. B=-6-4-15

=-25

so answer b is correct

Answer 2

Given : A = (3i ˆ – 4jˆ + 5kˆ ) and B = (– 2i ˆ + jˆ – 3kˆ)

To Find :  scalar product of two vectors

(a) -15

(b)-25

(c) 25

(d) 15.​

Solution:

A = (3i ˆ – 4jˆ + 5kˆ )

B = (– 2i ˆ + jˆ – 3kˆ)

Scaler product

=  3(-2)  + (-4)(1)  + 5(-3)

= -6 - 4 - 15

= - 25

scalar product of two vectors. A = (3i ˆ – 4jˆ + 5kˆ ) and B = (– 2i ˆ + jˆ – 3kˆ)

is - 25

correct option is   b) - 25

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