Question
Mathematics Question on Vector Algebra
If ∣a∣=2,b=2i^−j^−3k^ and the angle between a and b is 4π, then a⋅b is equal to
A
4√2
B
2√7
C
√30
D
√7
E
√14
Answer
2√7
Explanation
Solution
The correct option is (B): 2√7
If ∣a∣=2,b=2i^−j^−3k^ and the angle between a and b is 4π, then a⋅b is equal to
4√2
2√7
√30
√7
√14
2√7
The correct option is (B): 2√7