# Electrostatics · Physics · COMEDK

Start Practice## MCQ (Single Correct Answer)

COMEDK 2024 Evening Shift

A neutral water molecule is placed in an electric field $$E=2.5 \times 10^4 \mathrm{NC}^{-1}$$. The work done to rotate it by $$180^{\circ}$$ is $$5 \...

COMEDK 2024 Evening Shift

Two point charges $$\mathrm{M}$$ and $$\mathrm{N}$$ having charges $$+q$$ and $$-q$$ respectively are placed at a distance apart. Force acting between...

COMEDK 2024 Evening Shift

If 216 drops of the same size are charged at $$200 \mathrm{~V}$$ each and they combine to form a bigger drop, the potential of the bigger drop will be...

COMEDK 2024 Evening Shift

Three point charges are located on a circular arc at $$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$ as shown in the figure below. The total electric fi...

COMEDK 2024 Morning Shift

A square shaped aluminium coin weighs $$0.75 \mathrm{~g}$$ and its diagonal measures $$14 \mathrm{~mm}$$. It has equal amounts of positive and negativ...

COMEDK 2024 Morning Shift

If potential (in volt) in a region is expressed as $$\mathrm{V}(\mathrm{x}, \mathrm{y}, \mathrm{z})=6 \mathrm{xy}-\mathrm{y}+2 \mathrm{yz}$$, the elec...

COMEDK 2024 Morning Shift

Five charges, '$$q$$' each are placed at the comers of a regular pentagon of side '$$a$$' as shown in figure. First, charge from '$$A$$' is removed wi...

COMEDK 2024 Morning Shift

Two charges '$$-q$$' each are fixed, separated by distance '$$2 d$$'. A third charge '$$q$$' of mass '$$m$$' placed at the mid-point is displaced slig...

COMEDK 2024 Morning Shift

Two metal spheres, one of radius $$\frac{R}{2}$$ and the other of radius $$2 \mathrm{R}$$ respectively have the same surface charge density They are b...

COMEDK 2023 Morning Shift

When $$10^{19}$$ electrons are removed from a neutral metal plate, the electric charge on it is

COMEDK 2023 Evening Shift

Two point charges $$20 \mu \mathrm{C}$$ and $$-10 \mu \mathrm{C}$$ are separated by a distance of $$1 \mathrm{~m}$$ in air. At what point on the line ...

COMEDK 2023 Evening Shift

A spherical metal ball of density '$$\rho$$' and radius '$$r$$' is immersed in a liquid of density '$$\sigma$$'. When an electric field is applied in ...

COMEDK 2023 Evening Shift

PQRS is square of side $$1 \mathrm{~m}$$. A charge of $$100 \mu \mathrm{C}$$ is placed at the centre of the square. Then the work done to take $$3 \mu...

COMEDK 2023 Evening Shift

An electron and a proton having mass $$m_e$$ and $$m_p$$ respectively, initially at rest, move through the same distance '$$s$$' in a uniform electric...

COMEDK 2023 Evening Shift

The force between two electric point charges at rest in air is $$F_1$$ When the same arrangement is kept inside water, the force between them is $$F_2...

COMEDK 2022

Which of the following diagram represents the variation of the electric field with distance r from the centre of a uniformly charged non-conducting sp...

COMEDK 2022

Charge on electron is

COMEDK 2022

Two charged spheres of $$-20\mu$$C and $$60\mu$$C are kept at a certain distance. They are touched and kept again at the same distance. What is the ra...

COMEDK 2021

Insulators can be charged by which of the following process?

COMEDK 2021

Work done in moving a charge of 25C is 50 J. Calculate potential difference, between two points.

COMEDK 2021

What is the electric field near infinite plane sheet of charge density $$\sigma$$ ?

COMEDK 2020

Consider a thin spherical shell of radius R
consisting of uniform surface charge density s.
The electric field at a point of distance x from its
centr...

COMEDK 2020

A charge of 0.8 C is divided into two charges Q$$_1$$ and Q$$_2$$. These are kept at a separation of 30 cm. The force on Q$$_1$$ is maximum when...

COMEDK 2020

An electric dipole has a pair of equal and opposite point charges $$q$$ and $$-q$$ separated by a distance $$2x$$. The axis of the dipole is defined a...

COMEDK 2020

An electric dipole is placed in a uniform electric
field with the dipole axis making an angle $$\theta$$ with
the direction of the electric field. The...

COMEDK 2020

Two point charges A = +3 nC and B = +1 nC are placed 5 cm apart in air. The work done to move charge B towards A by 1 cm is

COMEDK 2020

The potential energies associated with four
orientations of an electric dipole in an electric
field are
(i) $$-5U_0$$ (ii) $$-7U_0$$ (iii) $$3U_0$$ (i...