Question

Assertion If angle between a and b is `30^(@)` . Then angle between 2a and `-(b) /(2)` will be `150^(@)`
Reason Sign of dot product of two vectors tells you whether angle between two vectors is acute or obtuse .
A. If both Assetion and Reason are correct but Reason is the correct explanation of Assertion.
B. If both Assetion and Reason are correct but Reason is not the correct explanation of Assertion.
C. If Asserion is true but Reason is false
D. If Asserion is false but Reason is true

Answer 1

Correct Answer - B
(b)` A.B =AB cos theta ` Here AB is always postive value of `cos theta` determine the sign ios A.B