Question

The angular separation between the vectors A = 4i + 3j + 5k and B = i – 2j + 2k is (in degrees) (a) 65.8 (b) 66.8 (c) 67.8 (d) 68.8 I got this question during an interview. The question is from Cartesian Coordinate System in division Coordinate Systems and Transforms of Electromagnetic Theory Select the correct answer from above options Electromagnetic Theory questions and answers, Electromagnetic Theory questions pdf, Electromagnetic Theory question bank, Electromagnetic Theory questions and answers pdf, mcq on Electromagnetic Theory pdf,electromagnetic theory book pdf,electromagnetic theory pdf notes,electromagnetic theory lecture notes,electromagnetic theory of light,maxwell electromagnetic theory,electromagnetic theory proposed by,electromagnetic theory engineering physics,electromagnetic theory nptel

Answer 1

Right answer is (c) 67.8 For explanation I would say: The dot product the vector is 8. Angle of separation is cos θ = 8/ (7.07 X 3) = 0.377 and θ = cos^-1(0.377) = 67.8.