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Shubham Kumar posted an Question
August 26, 2021 • 17:18 pm
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30 points
30 points
- IIT JAM
- Physics (PH)
Question 10 under a rotation by an angle 0 about x-axis , the vector field that remains invariant is a. 2-ý + b. 32 c. 5v2 d. v3
Question 10 Under a rotation by an angle 0 about x-axis , the vector field that remains invariant is a. 2-ý + b. 32 C. 5V2 d. v3
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Isha lohan 1![best-answer]()
See below is the attached theory in 2 D plane, in x-y plane. It can be said to be rotating around z axis. Right! Any vector rotating in x-y plane is rotating around z axis. Similarly now imagine vectors rotating around X-axis. That means that those vectors will rotate and may lie in y-z plane. Now any vector lying in y-z plane when rotate, its y and z component will change. But as it is perpendicular to x, its x component will not change. You need to imagine this situation in 3D. Any vector rotating around x axis, its x component will not change. Right! You may see second figure attached. In your options, only C option is one which has only x component, look at my second attached fig, now if you rotate a vector in x direction around x axis, it will be not affected, so option C is correct.