The cross product of two parallel vectors A and B (i.e. A x B) is equal to:
Correct answer: D. 0
- A. AB sin θ nˆ
- B. AB cos θ
- C. AB
- D. 0
Explanation
When two vectors are parallel, the angle between them is 0°. In this cases, the sine of the angle is 0. Therefore, the cross product of two parallel vectors will always be zero. So, when two vectors A and B are parallel, their cross product A x B is equal to zero.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Vectors and Equilibrium
Vectors have magnitude and direction, unlike scalars, and are combined by head-to-tail or parallelogram methods. Work covers rectangular components, equilibrium when the resultant force is zero, the scalar product for work and projections, and the vector product for torque and cross-product direction using the right-hand rule.
Practise Vectors and Equilibrium
431 free Vectors and Equilibrium MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Vectors and Equilibrium questions
The scalar product of two vectors is negative when:
For a vector V:
If two non-zero vectors a and b are parallel to each other, then:
The magnitude of.....
If the dot product of two non-zero vectors A and B is zero, their cross product will be of magnitude:
The y-component of a vector 100N force, making an angle of 30° with the x-axis is: