1
JEE Main 2024 (Online) 8th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Two charged conducting spheres of radii $$a$$ and $$b$$ are connected to each other by a conducting wire. The ratio of charges of the two spheres respectively is:

A
$$a b$$
B
$$\frac{b}{a}$$
C
$$\frac{a}{b}$$
D
$$\sqrt{a b}$$
2
JEE Main 2024 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Two identical conducting spheres P and S with charge Q on each, repel each other with a force $$16 \mathrm{~N}$$. A third identical uncharged conducting sphere $$\mathrm{R}$$ is successively brought in contact with the two spheres. The new force of repulsion between $$\mathrm{P}$$ and $$\mathrm{S}$$ is :

A
1 N
B
6 N
C
12 N
D
4 N
3
JEE Main 2024 (Online) 6th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

$$\sigma$$ 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 :

A
$$\sigma / \epsilon_o R$$
B
$$\sigma / \in_o$$
C
$$\sigma / 2 \epsilon_o$$
D
$$\sigma / 4 \epsilon_o$$
4
JEE Main 2024 (Online) 5th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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

A
To protect tyres from catching dirt from ground
B
It is a custom
C
To alert other vehicles
D
To conduct excess charge due to air friction to ground and prevent sparking
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