Electric Fields and Dipoles

Vocabulary flashcards covering key concepts related to Electric Fields and Dipoles.

Electric Field (E)

A vector quantity that represents the force per unit charge exerted on a positive test charge placed in the field.

Electrostatic Force (F)

The force experienced by a charged particle due to the electric fields created by other charges.

Test Charge (q0)

A small positive charge used to measure the electric field without significantly influencing it.

Coulomb's Law

A law expressing the force between two charged particles, stating it is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Electric Field Lines

Visual representations of electric fields, showing the direction and strength of the field, originating from positive and terminating at negative charges.

Dipole Moment (p)

A vector quantity that describes the separation of positive and negative charges within a system, given by the product of charge and distance.

Torque () on a Dipole

A measure of the force causing the dipole to rotate in an electric field, calculated as  = p × E.

Potential Energy (U) of a Dipole

The energy associated with the orientation of a dipole in an electric field, described by U = -p • E.

Uniform Electric Field

An electric field with a constant strength and direction throughout the space.

Magnitude of Electric Field due to Point Charge

E = 1/(4πε₀) * |q|/r², where 'q' is the charge and 'r' is the distance from the charge.

Electric Field due to Dipole

E = (1/(4πε₀)) * (2p)/(z³), where 'p' is the dipole moment and 'z' is the distance along the dipole axis.

Charge Density (λ)

A measure of charge per unit length, surface, or volume, depending on the distribution of the charge.

Superposition Principle

The principle stating that the net electric field created by multiple charges is the vector sum of the individual electric fields due to each charge.

Line Charge Density (λ)

Charge per unit length, used to describe uniform charge distributions along a line.

Surface Charge Density (σ)

Charge per unit area, used for uniformly charged surfaces.

Volume Charge Density (ρ)

Charge per unit volume, relevant for three-dimensional charge distributions.

SI Unit of Electric Field

Newton per Coulomb (N/C), representing the force experienced by a unit positive charge.

Direction of Electric Field Lines

Electric field lines point from positive to negative charges, illustrating the direction a positive test charge would move.

Distance Dependence of Electric Field

The magnitude of the electric field decreases with the square of the distance from the charge.

Field Lines and Electric Field Strength

The density of electric field lines in a region represents the strength of the electric field; closer lines indicate a stronger field.