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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 10335 Points
4 years 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
4 years ago
a.b= abcostheta and a*b= absintheta so abcostheta/absintheta =1 means ab cancel tantheta =1 so theta =45
 

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