| → A | = 4 u n i t s | → B | = 10 u n i t s If angle between → A & → B is 60 ∘ then find → A . → B . Options: A . &nbsp20 B . &nbsp40 C . &nbsp0 D . &nbsp20√3

Answer: Option A : A → A . → B = | A | | B | c o s 60 ∘ . | ¯ ¯¯ ¯ A | = 4 ; | ¯ ¯¯ ¯ B | = 10 = 4 × 10 × 1 2 Scalar product of → A & → B = 20

|→A|=4 units |→B|=10 units If angle between

Question

| \to A | = 4 u n i t s

| \to B | = 10 u n i t s

If angle between

\to A

\to B

60^{\circ}

then find

\to A

\to B

Options:

A . 20

B . 40

C . 0

D . 20√3

Answer: Option A
:
A

\to A

\to B

| A | | B | c o s 60^{\circ}

| ¯ ¯¯ ¯ A | = 4

;

| ¯ ¯¯ ¯ B | = 10

4 \times 10 \times \frac{1}{2}

Scalar product of

\to A

\to B

= 20

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