Assertion If angle between a and b is 30^(@) . Then angle between 2a and -(b) /(2) will be 150^(@) ReasonSign of dot product of two vectors tells you whether angle between two vectors is acute or obtuse .

Assertion If angle between a and b is 30^(@) . Then angle between 2a a

1.	Assertion If angle between a and b is 30^(@) . Then angle between 2a and -(b) /(2) will be 150^(@) ReasonSign of dot product of two vectors tells you whether angle between two vectors is acute or obtuse .
Answer» If both Assetion and REASON are CORRECT but Reason is the correct explanation of Assertion. If both Assetion and Reason are correct but Reason is not the correct explanation of Assertion. If Asserion is true but Reason is FALSE If Asserion is false but Reason is true Solution :(b)` A.B =AB COS theta ` Here AB is always postive value of `cos theta` DETERMINE the sign ios A.B