WBJEE · Physics · Rotational Motion
particle is moving in an elliptical orbit as shown in figure. If \(\vec{p}, \vec{L}\) and \(\vec{r}\) denote the linear momentum, angular momentum and position vector of the particle (from focus \(\mathrm{O}\) ) respectively at a point \(\mathrm{A}\), then the direction of \(\vec{\alpha}=\overrightarrow{\mathrm{p}} \times \overrightarrow{\mathrm{L}}\) is along
- A + ve \(x\) axis
- B - ve \(x\) axis
- C + ve y axis
- D - ve y axis
Answer & Solution
Correct Answer
(A) + ve \(x\) axis
Step-by-step Solution
Detailed explanation
\(\vec{\alpha}=\overrightarrow{\mathrm{p}} \times \overrightarrow{\mathrm{L}}\) \(\vec{L}\) is along Z-axis
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- Two spheres \(\mathrm{S}_1\) and \(\mathrm{S}_2\) of masses \(\mathrm{m}_1\) and \(\mathrm{m}_2\) respectively collide with each other. Initially \(\mathrm{S}_1\) is at rest and \(\mathrm{S}_2\) is movingwith velocity v along x -axis. After collision \(\mathrm{S}_2\) has a velocity \(\frac{\mathrm{v}}{2}\) in a direction perpendicular to the original direction. The sphere \(\mathrm{S}_1\) moves after collisionWBJEE 2025 Medium
- The bob of a swinging seconds pendulum (one whose time period is \(2 \mathrm{~s}\) ) has a small speed \(\mathrm{v}_{0}\) at its lowest point. Its height from this lowest point \(2.25 \mathrm{~s}\) after passing through it is given byWBJEE 2020 Medium
- Water in filled in a cylindrical vessel of height H. A hole is made at height z from the bottom, as shown in the figure.
The value of of z for which the range (R) of the emerging water through the hole will be maximum for
WBJEE 2024 Medium - A charged particle moves with constant velocity in a region where no effect of gravity is felt but an electrostatic field \(\overrightarrow{\mathrm{E}}\)
together with a magnetic field \(\vec{B}\) may be present. Then which of the following cases are possible?WBJEE 2020 Easy - A thin glass rod is bent in a semicircle of radius \(\mathrm{R}\). A change is non-uniformly distributed along the rod with a linear charge density \(\lambda=\lambda_0 \sin \left(\lambda_0\right.\) is a positive constant). The electric field at the centre \(P\) of the semicircle is,
WBJEE 2023 Easy - Current through \(\mathrm{ABC}\) and \(\mathrm{A}^{\prime} \mathrm{B}^{\prime} \mathrm{C}^{\prime}\) is \(\mathrm{I}\). What is the magnetic field at \(\mathrm{P}\) ? \(\mathrm{BP}=\mathrm{PB}^{\prime}=\mathrm{r}\left(\right.\) Here \(\mathrm{C}^{\prime} \mathrm{B}^{\prime} \mathrm{PBC}\) are collinear)
WBJEE 2011 Medium
More PYQs from WBJEE
- \[
\mathrm{X} \stackrel{\mathrm{PCl}_{\mathrm{s}}}{\longrightarrow} \mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl}
\]
\[
\mathrm{Y} \stackrel{\mathrm{PCl}_5}{\longrightarrow} \mathrm{CH}_3 \mathrm{COCl}
\]
\(\mathrm{X}\) and \(\mathrm{Y}\) areWBJEE 2010 Medium - A cricket ball thrown across a field is at heights \(h_{1}\) and \(h_{2}\) from the point of projection at times \(t_{1}\) and \(t_{2}\) respectively after the throw. The ball is caught by a fielder at the same height as that of projection. The time of flight of the ball in this journey isWBJEE 2014 Hard
- If \(x \frac{d y}{d x}+y=\frac{x f(x y)}{f^{\prime}(x y)}\), then \(|f(x y)|\) is equal toWBJEE 2021 Easy
- At constant pressure, the heat of formation of a compound is not dependent on temperature, whenWBJEE 2019 Hard
- If \(f(x)=e^{x}(x-2)^{2},\) thenWBJEE 2013 Easy
- The inputs to the digital circuit are as shown below. The output \(Y\) is
WBJEE 2015 Easy