JEE Main 2022 (Online) 24th June Evening Shift | Electrostatics Question 155 | Physics

Two identical charged particles each having a mass 10 g and charge 2.0 $$\times$$ 10^$$-$$7C are placed on a horizontal table with a separation of L between them such that they stay in limited equilibrium. If the coefficient of friction between each particle and the table is 0.25, find the value of L. [Use g = 10 ms^$$-$$2]

12 cm

10 cm

8 cm

5 cm

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

-1

A long cylindrical volume contains a uniformly distributed charge of density $$\rho$$. The radius of cylindrical volume is R. A charge particle (q) revolves around the cylinder in a circular path. The kinetic energy of the particle is :

$${{\rho q{R^2}} \over {4{\varepsilon _0}}}$$

$${{\rho q{R^2}} \over {2{\varepsilon _0}}}$$

$${{q\rho } \over {4{\varepsilon _0}{R^2}}}$$

$${{4{\varepsilon _0}{R^2}} \over {q\rho }}$$

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

A vertical electric field of magnitude 4.9 $$\times$$ 10⁵ N/C just prevents a water droplet of a mass 0.1 g from falling. The value of charge on the droplet will be :

(Given : g = 9.8 m/s²)

1.6 $$\times$$ 10^$$-$$9 C

2.0 $$\times$$ 10^$$-$$9 C

3.2 $$\times$$ 10^$$-$$9 C

0.5 $$\times$$ 10^$$-$$9 C

JEE Main 2021 (Online) 1st September Evening Shift

MCQ (Single Correct Answer)

-1

A cube is placed inside an electric field, $$\overrightarrow E = 150{y^2}\widehat j$$. The side of the cube is 0.5 m and is placed in the field as shown in the given figure. The charge inside the cube is :

JEE Main 2021 (Online) 1st September Evening Shift Physics - Electrostatics Question 158 English