1
JEE Main 2023 (Online) 25th January Evening Shift
+4
-1 A point charge of 10 $$\mu$$C is placed at the origin. At what location on the X-axis should a point charge of 40 $$\mu$$C be placed so that the net electric field is zero at $$x=2$$cm on the X-axis?

A
$$x=6$$ cm
B
$$x=8$$ cm
C
$$x=4$$ cm
D
$$x=-4$$ cm
2
JEE Main 2023 (Online) 24th January Evening Shift
+4
-1 The electric potential at the centre of two concentric half rings of radii R$$_1$$ and R$$_2$$, having same linear charge density $$\lambda$$ is : A
$$\frac{\lambda}{2\in_0}$$
B
$$\frac{\lambda}{\in_0}$$
C
$$\frac{2\lambda}{\in_0}$$
D
$$\frac{\lambda}{4\in_0}$$
3
JEE Main 2023 (Online) 24th January Morning Shift
+4
-1 If two charges q$$_1$$ and q$$_2$$ are separated with distance 'd' and placed in a medium of dielectric constant K. What will be the equivalent distance between charges in air for the same electrostatic force?

A
$$d\sqrt k$$
B
$$1\,.\,5d\sqrt k$$
C
$$k\sqrt d$$
D
$$2d\sqrt k$$
4
JEE Main 2022 (Online) 29th July Evening Shift
+4
-1 Two identical metallic spheres $$\mathrm{A}$$ and $$\mathrm{B}$$ when placed at certain distance in air repel each other with a force of $$\mathrm{F}$$. Another identical uncharged sphere $$\mathrm{C}$$ is first placed in contact with $$\mathrm{A}$$ and then in contact with $$\mathrm{B}$$ and finally placed at midpoint between spheres A and B. The force experienced by sphere C will be:

A
3F/2
B
3F/4
C
F
D
2F
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination