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12th Physics Monthly Test - 3 ( Electrostatics )

St. Britto Hr. Sec. School - Madurai

12th Physics Monthly Test - 3 ( Electrostatics )-Aug 2020

Time : 2.30 Hours

Part - A

Generic 2 - Answer All Question

If a point charge is rotated in an arc of radius r around a charge q, what will be the work done. Explain.

When we rotate the blades, it starts to rotate as usual. Why it is so??

Give the relation between electric field and electric potential.

The electric field due to a point charge depends on the distance r as parallely indicate how each of
the following quantities depends on r?
a. Intensity of light from a point source.
b. Electrical potential due to a point charge.
c. Electrical potential at a distance r from to centre of a charged metallic sphere Given r < radius of
the sphere.

What is dielectric strength?

Will there be any effect on the potential at the point if the medium around this point is changed?

When does a dielectric said to be polarized?

What are the differences between Coulomb force and gravitational force?

What do you mean by Potential Energy of an electric dipole, when placed in electric field?

What is the electric flux through a cube of side 1cm which encloses on electric dipole?

(i) Electric field lines donot have sudden breaks why is it so?
(ii) Explain why two field lines never cross each other at any point.
What are the properties of an equipotential surface?

What orientation of an electric dipole in a uniform electric field corresponds to its
(i) stable and
(ii) unstable equilibrium? Depict the orientations.

What are induced dipoles.

Body placed at the centre are shown. Identify the polarity of the charge & draw the electric field lines due to it

Two concentric metallic spherical shells of radii Rand 2 R are given charges Q₁ & Q₂ respectively. The surface charge density on the outer surfaces of the shells are equal. Determine the ratio Q₁=Q₂.
Two concentric metallic spherical shells of radii Rand 2 R are given charges Q₁ & Q₂ respectively.
The surface charge density on the outer surfaces of the shells are equal. Determine the ratio Q₁ =Q₂.

Part - B

Generic 3 - Answer All Question

Define potential difference and derive.

Calculate the electric dipole moment for the following charge configurations.

Consider four equal charges q₁,q₂, q₃ and q₄ = q = +1μC located at four different points on a circle of radius 1m, as shown in the figure. Calculate the total force acting on the charge q₁ due to all the other charges.
How do we determine the electric field due to a continuous charge distribution? Explain.

Obtain the expression for electric field due to an infinitely long charged wire.

Deduce electric flus for closed surfaces.

Derive the expressions for the potential energy of a system of point charges.

Consider the charge configuration as shown in the figure. Calculate the electric field at point A. If an electron is placed at points A, what is the acceleration experienced by this electron? (mass of the electron = 9.1 × 10^-31 kg and charge of electron = −1.6 × 10^-19C)

Explain in detail the construction and working of a Van de Graaff generator.

Explain the Lightning arrester or lightning conductor.

Calculate the number of electrons in one coulomb of negative charge.

Part - C

Generic 5 - Answer All Question

The electric potential in region is represented as V = 2x +3y - z. Obtain an expression for electric field strength.
It requires 50 μJ of work to carry a 2C charge from point R to S. What is the potential difference between these points?

A water molecule has an electric dipole moment of 6.3 × 10^-30 Cm. A sample contains 10²² water molecules, with all the dipole moments aligned parallel to the external electric field of magnitude 3 × 10⁵ NC^-1. How much work is required to rotate all the water molecules from θ = 0⁰ to 90⁰?

Discuss the various properties of conductors in electrostatic equilibrium.

Devise an arrangement of three point charges separated by finite distance that has zero electric potential energy.

What charge would be required to electrify a sphere of radius 25cm. So as to get a surface charge density of \(\frac{3}{\pi}\) cm^-1?

How many electrons are there in one coulomb of negative charge?

Two point charges having equal charges separated by 1m distance experiences a force of 8N. What will be the force experienced by them, if they are held in water at the same distance?

In the circuit shown in figure. Find
(i) The equivalent capacitance and
(ii) The charge stored in each capcicitor

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