If 
= 
. 
, 
then the value of 
is :
A
(A2 + B2 + AB)1/2
B
C
A + B
D
(A2 + B2 + 
AB)1/2
AB)1/2
Text Solution
Verified by ExpertsThe correct answer is:
A
| 
× 
| = AB sin θ
and 
. 
= AB cos θ
Given, 
= 
. 
…(i)
But 
= 
sin θ = AB sin θ
and 
. = 
cos θ = AB sin θ
Make these substitution in Eq. (i), we get
AB sin θ = 
AB cos θ
or tan θ = 
∴ θ = 60°
The addition of vector 
and 
can be given by the law of parallelogram.
∴ 
= 
= 
= (A 2 + B 2 + AB) 1/2
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