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Concepts Of Physics MCQ Edition [Volume 1]
Exam
Concepts Of Physics MCQ Edition [Volume 1]
Subject
Physics
Chapter
Physics and Mathematics

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Physics and Mathematics

For two vectors A and B , the magnitude of their vector product can...

For two vectors A⃗\vec{A} and B⃗\vec{B}, the magnitude of their vector product can be

Options

  1. Aequal to zero
  2. Bgreater than ABAB
  3. Cless than ABAB
  4. Dequal to ABAB

Correct answer

D. equal to ABAB

Step-by-step solution

The magnitude of the vector product of two vectors A⃗\vec{A} and B⃗\vec{B} is given by ∣A⃗×B⃗∣=ABsin⁡θ|\vec{A} \times \vec{B}| = AB \sin \theta, where θ\theta is the angle between the vectors.

Since the value of sin⁡θ\sin \theta lies in the range [0,1][0, 1] for θ∈[0,π]\theta \in [0, \pi], we have 0≤sin⁡θ≤10 \le \sin \theta \le 1.

Multiplying by ABAB, we get 0≤ABsin⁡θ≤AB0 \le AB \sin \theta \le AB.

Thus, the magnitude of the vector product can be zero (if θ=0\theta = 0 or π\pi), less than ABAB (if 0<θ<π/20 < \theta < \pi/2 or π/2<θ<π\pi/2 < \theta < \pi), or equal to ABAB (if θ=π/2\theta = \pi/2).

It can never be greater than ABAB.
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