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If F⃗ is the force acting on a particle having position vector r⃗ and ? ⃗ be the torque of this force about the origin, then:
Options
(a) r⃗ . ? ⃗ > 0 and F⃗ . ? ⃗ < 0
(b) r⃗ . ? ⃗ = 0 and F⃗ . ? ⃗ = 0
(c) r⃗ . ? ⃗ = 0 and F⃗ . ? ⃗ ≠ 0
(d) r⃗ . ? ⃗ ≠ 0 and F⃗ . ? ⃗ = 0
Correct Answer:
r⃗ . ? ⃗ = 0 and F⃗ . ? ⃗ = 0
Explanation:
? ⃗ = r⃗ x F⃗ ⇒ r⃗ . ? ⃗ = 0 and F⃗ . ? ⃗ = 0
Since, ? ⃗ is perpendicular to the plane of r⃗ and F⃗ , hence the dot product of ? ⃗ with r⃗ and F⃗ is zero.
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Topics: Motion of system of Particles and Rigid Body
(73)
Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If force(F),velocity(v) and time(T) are taken as units, then the dimensions of mass are
- The order of radius of the nucleus of an atom is
- The Boolean expression P+ P ̅ Q, where P and Q are the inputs of the logic
- In a thermodynamic system, working substance is ideal gas. Its internal energy
- In a LCR series circuit, the potential difference between the terminals of the inductor
Topics: Motion of system of Particles and Rigid Body (73)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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