Vector AlgebraHardQuestion 5139
Question
If A = 2î + 3ĵ − k̂ and B = î − 2ĵ + 3k̂, then A·B is:
- A−7Correct
- B7
- C−4
- D4
Correct answer
−7
Explanation
A·B = (2)(1) + (3)(−2) + (−1)(3) = 2 − 6 − 3 = −7.
NEET Physics · Hard
Basic Mathematics & Vectors: Vector Algebra MCQ
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