JEE Main 2024 (Online) 6th April Morning Shift | Electrostatics Question 9 | Physics

$$\sigma$$ is the uniform surface charge density of a thin spherical shell of radius R. The electric field at any point on the surface of the spherical shell is :

$$\sigma / \epsilon_o R$$

$$\sigma / \in_o$$

$$\sigma / 2 \epsilon_o$$

$$\sigma / 4 \epsilon_o$$

JEE Main 2024 (Online) 5th April Evening Shift

MCQ (Single Correct Answer)

-1

The vehicles carrying inflammable fluids usually have metallic chains touching the ground:

To protect tyres from catching dirt from ground

It is a custom

To alert other vehicles

To conduct excess charge due to air friction to ground and prevent sparking

JEE Main 2024 (Online) 5th April Morning Shift

MCQ (Single Correct Answer)

-1

In hydrogen like system the ratio of coulombian force and gravitational force between an electron and a proton is in the order of :

10¹⁹

10³⁹

10²⁹

10³⁶

JEE Main 2024 (Online) 4th April Evening Shift

MCQ (Single Correct Answer)

-1

A charge $$q$$ is placed at the center of one of the surface of a cube. The flux linked with the cube is:

$$\frac{q}{2 \epsilon_0}$$

Zero

$$\frac{q}{4 \epsilon_0}$$

$$\frac{q}{8 \epsilon_0}$$

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