Class XII Physics: Rotational Dynamics, Thermodynamics, Electromagnetism, Atomic Structure

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Questions and Answers

What is the study of electric charges at rest known as?

Electromagnetic induction

Oscillations

Superposition of waves

Electrostatics (correct)

What is the property by virtue of which a particle produces electrical influence around it?

Velocity

Charge (correct)

Acceleration

Mass

What do like charges do when they encounter each other?

They attract each other

They undergo no interaction

They repel each other (correct)

They cancel each other out

According to Coulomb's law, how does the force between two point static charges change with the distance between them?

It decreases inversely proportional to the distance squared Signup and view all the answers

What does the electric field intensity at a point represent?

The force acting on a unit positive charge at that point Signup and view all the answers

What are electric lines of force?

Imaginary lines drawn to represent the electric field due to a charge Signup and view all the answers

What is the definition of electric flux?

The total number of electric lines of force that normally pass through a surface Signup and view all the answers

What is Gauss's theorem related to?

The surface integral of the electric field intensity over any closed surface in free space Signup and view all the answers

What is the SI unit of electric flux?

N m^2 C^-1 or V m Signup and view all the answers

What does Gauss's law state about the electric field outside a uniformly charged thin spherical shell?

The electric field is inversely proportional to the square of the distance from the center of the shell Signup and view all the answers

What is the electric flux through a Gaussian surface inside a cavity with no charge present?

Zero Signup and view all the answers

What does Gauss's law state about the electric field at a point on the surface of a uniformly charged thin spherical shell?

The electric field is maximum at all points on the surface Signup and view all the answers

What is used as a Gaussian surface in Gauss's law when calculating the electric field due to a charge distribution?

A closed surface enclosing a net charge within it Signup and view all the answers

What does Gauss's law state about the electric field inside a cavity within a uniformly charged thin spherical shell?

The electric field is zero at all points within the cavity Signup and view all the answers

What does Gauss's theorem state about the relationship between the integral of electric field intensity over any closed surface and net charge enclosed within that surface?

The integral is equal to 1 / ε0 times the net charge enclosed within that surface Signup and view all the answers

What property can be used for electrostatic shielding according to Gauss's law?

Electric field inside a cavity being zero Signup and view all the answers

Study Notes

Electric Charges at Rest

The study of electric charges at rest is known as electrostatics.

Electric Influence

The property by virtue of which a particle produces electrical influence around it is its electric charge.

Behavior of Like Charges

Like charges repel each other when they encounter each other.

Coulomb's Law

According to Coulomb's law, the force between two point static charges decreases as the square of the distance between them increases.

Electric Field Intensity

Electric field intensity at a point represents the force experienced by a unit positive charge at that point.

Electric Lines of Force

Electric lines of force are imaginary lines that emerge from positive charges and enter negative charges.

Electric Flux

Electric flux is the measure of the number of electric lines of force passing through a given area.
Electric flux is defined as the dot product of the electric field intensity and the area vector.

Gauss's Theorem

Gauss's theorem is related to the distribution of electric flux through a closed surface.
The SI unit of electric flux is Nm²C⁻¹.

Electric Field Outside a Uniformly Charged Spherical Shell

According to Gauss's law, the electric field outside a uniformly charged thin spherical shell is zero.

Electric Flux Through a Gaussian Surface

The electric flux through a Gaussian surface inside a cavity with no charge present is zero.

Electric Field at a Point on a Spherical Shell

According to Gauss's law, the electric field at a point on the surface of a uniformly charged thin spherical shell is perpendicular to the surface.

Gaussian Surface

A spherical surface can be used as a Gaussian surface in Gauss's law when calculating the electric field due to a charge distribution.

Electric Field Inside a Cavity

According to Gauss's law, the electric field inside a cavity within a uniformly charged thin spherical shell is zero.

Gauss's Law

Gauss's theorem states that the integral of electric field intensity over any closed surface is proportional to the net charge enclosed within that surface.

Electrostatic Shielding

Conductor shells can be used for electrostatic shielding according to Gauss's law.

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Description

Test your knowledge of rotational dynamics, mechanical properties of fluids, thermodynamics, electromagnetism, and atomic structure concepts covered in Class XII Physics curriculum.