Physics · 2019
JEE Main · 10 April 2019, Shift 1 · Q16
A uniformly charged ring of radius 3 a and total charge q is placed in x y -plane centred at origin. A point charge q is moving towards the ring…
A uniformly charged ring of radius $\displaystyle 3 a$ and total charge q is placed in $\displaystyle x y$-plane centred at origin. A point charge q is moving towards the ring along the $\displaystyle z$-axis and has speed $\displaystyle v$ at $\displaystyle z=4 \mathrm{a}$. The minimum value of $\displaystyle v$ such that it crosses the origin is :
Official answer
(2)
$\displaystyle \sqrt{\frac{2}{\mathrm{~m}}}\left(\frac{2}{15} \frac{\mathrm{q}^2}{4 \pi \epsilon_0 \mathrm{a}}\right)^{1 / 2}$
More from Electrostatics
- The vehicles carrying inflammable fluids usually have metallic chains touching the ground:2024
- A point charge of +12 μ C is at a distance 6 cm vertically above the centre of a square of side 12 cm as shown in figure. The magnitude of the…2021
- An electron revolves around an infinite cylindrical wire having uniform linear charge density 2 × 10^-8 C m^-1 in circular path under the influence…2023
- Six point charges are kept 60^° apart from each other on the circumference of a circle of radius R as shown in figure. The net electric field at the…2026
- A particle of charge ' -q ' and mass ' m ' moves in a circle of radius ' r ' around an infinitely long line charge of linear charge density ' +λ '.…2024
- Given below are two statements: one is labelled as Assertion and the other is labelled as Reason (R). Assertion: Work done by electric field on…2024
- Ten charges are placed on the circumference of a circle of radius R with constant angular separation between successive charges. Alternate charges 1,…2020
- Consider two infinitely large plane parallel conducting plates as shown below. The plates are uniformly charged with a surface charge density +σ and…2025
JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.