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What is the angle between two vectors a and b, if a . b=a * b A. 180 B. 90 C. 0 D. 45

What is the angle between two vectors a and b, if a . b=a * b
A. 180
B. 90
C. 0
D. 45

Grade:12th pass

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
one year ago
Dear student

These two quantities can never be equal as one is scalar and another is vector

However comparing magnitude

ab cos (theta) = ab ( sin. Theta)

Tan ( theta ) = 1

Theta = 45

Regards
Deepanshi
19 Points
one year ago
a.b= abcostheta and a*b= absintheta so abcostheta/absintheta =1 means ab cancel tantheta =1 so theta =45
 

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