Otis Singleton
An electric dipole is a fundamental concept in physics and chemistry that deals with the separation of positive and negative electric charges in an electromagnetic system. It is defined as a pair of equal and opposite charges separated by a small distance, with the direction of the dipole going from the negative charge to the positive charge. The dipole moment, a vector quantity, is used to determine the strength of an electric dipole and is given by the product of the magnitude of the charges and the separation between them. While the dipole direction in physics follows the convention of pointing from negative to positive charge, chemistry adopts the opposite convention. Electric dipoles are essential in understanding polarisation and have applications in various fields, including electrostatics and chemistry.
| Characteristics | Values |
|---|---|
| Definition | A couple of opposite charges ("q" and "-q") separated by a distance ("d") |
| Direction | From negative charge to positive charge |
| Midpoint | The centre of the dipole |
| Example | A pair of electric charges of two opposite signs and equal magnitude separated by distance |
| Symbol | "p" |
| Type of quantity | Vector quantity |
| Magnitude | Product of either charge with the distance between them |
| Formula | (\begin \overrightarrow = Q \overrightarrow \end ) |
| Unit | Coulomb-meter (C-m) |
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What You'll Learn
Electric dipole moment
An electric dipole is defined as a pair of equal and opposite charges that are separated by a small distance. The electric dipole moment is a vector quantity that describes the strength of an electric dipole to produce an electric field. It is the product of the magnitude of the charges and the separation between them. The direction of the electric dipole moment is from the negative charge to the positive charge, although the opposite direction is used in chemistry.
The electric dipole moment is particularly useful in the context of an overall neutral system of charges, such as a pair of opposite charges or a neutral conductor in a uniform electric field. It plays an important role in understanding the concept of polarisation and is used to calculate the percentage of ionic character of a bond, estimate bond angles, and determine the geometry of molecules.
The dipole moment of a bar magnet, for example, points from its magnetic south to its magnetic north pole. Similarly, the electric dipole moment vector points from the negative charge to the positive charge. This definition is used in physics, while the opposite direction is used in chemistry.
The electric dipole moment can be visualised using an array of paired opposite charges. The relation for the electric dipole moment in this case is expressed mathematically. The dipole moment is also related to the energy and torque of a dipole in a uniform electric field. When the dipole is parallel to the field, the torque is minimised and the potential energy is lowered.
In summary, the electric dipole moment is a fundamental concept in physics and chemistry that characterises the behaviour of electric dipoles. It is a vector quantity with a specific direction and magnitude, and it plays a crucial role in understanding and predicting the behaviour of various systems, from simple electric dipoles to more complex molecules.
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Electric dipole direction
An electric dipole is defined as a pair of equal and opposite electric charges that are separated by a small distance. The direction of an electric dipole is always from the negative charge to the positive charge. This is the convention followed in physics, while the opposite direction is used in chemistry.
The dipole moment vector p points from the negative charge to the positive charge. This vector quantity has both magnitude and direction and is used to determine the strength of an electric dipole. The dipole direction tends to align itself with an external electric field. The electric flux lines produced by the charges in the dipole oppose the flux lines of the external field.
The dipole moment is particularly useful in the context of a neutral system of charges, such as a pair of opposite charges or a neutral conductor in a uniform electric field. In this context, the dipole moment can be visualized as an array of paired opposite charges.
In a non-uniform electric field, a dipole may experience a net force since the force on one end of the dipole may no longer balance the force on the other end. This net force is generally parallel to the dipole moment.
The axis of the electric dipole moment is the line that joins the two charges. When the dipole is parallel to the electric field, the torque on the dipole is at a minimum. The potential energy of the dipole is minimized when it is parallel to the field, maximized when it is antiparallel, and zero when it is perpendicular.
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Electric dipole magnitude
An electric dipole is defined as a pair of equal and opposite electric charges separated by a small distance. The direction of an electric dipole is from the negative charge to the positive charge, although the opposite is true in chemistry, where the convention is from positive to negative. The simplest example of an electric dipole is a pair of electric charges of equal magnitude but opposite sign, separated by a distance.
The magnitude of an electric dipole is the product of either of the charges and the distance between them. This can be expressed mathematically as:
> \(\begin{array}{l}
> \overrightarrow{p} = Q \overrightarrow {d} \end{array} \)
Where p is the electric dipole moment and d is the displacement vector pointing from the negative charge to the positive charge. The dipole moment determines the strength of an electric dipole to produce an electric field. It is a vector quantity, meaning it has both magnitude and direction.
The dipole moment is particularly useful in the context of an overall neutral system of charges, such as a pair of opposite charges or a neutral conductor in a uniform electric field. In such a system, the dipole moment can be visualized as an array of paired opposite charges.
The electric dipole moment plays an important role in understanding the concept of polarisation. It is also used to calculate the percentage of ionic character in a bond, estimate bond angles, study electric polarisation, and determine the geometry of molecules.
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Electric dipole in physics vs chemistry
An electric dipole is a pair of equal and opposite electric charges that are separated by a small distance. The simplest example of an electric dipole is a pair of electric charges of two opposite signs and equal magnitude separated by a distance. The midpoint of the two charges is called the centre of the dipole.
In physics, the direction of an electric dipole is from the negative charge to the positive charge. The dipole direction tends to align itself with an external electric field. The dipole moment is particularly useful in the context of an overall neutral system of charges, such as a pair of opposite charges or a neutral conductor in a uniform electric field.
In chemistry, the convention is taken to be the opposite, i.e. from the positive charge to the negative charge. This is because the electric flux lines produced by the charges of the dipole itself point from the positive charge to the negative charge, and these lines oppose the flux lines of the external field.
The electric dipole moment is a vector quantity, meaning it has a specific direction and magnitude. It is used to calculate the percentage of ionic character in a bond, estimate bond angles, study electric polarisation, and determine the geometry of molecules. The SI unit of the electric dipole moment is Coulomb-meter (C-m).
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Electric dipole examples
An electric dipole is defined as a pair of equal and opposite electric charges that are separated by a small distance. The direction of an electric dipole is from the negative charge to the positive charge, though this convention is reversed in chemistry.
- Water Molecule: A water molecule can be modelled as an electric dipole due to the asymmetrical arrangement of its atoms. The two hydrogen atoms are not symmetrically arranged around the oxygen atom, resulting in a separation of charge that can be modelled as an electric dipole.
- Atoms: Two atoms separated by a small distance can form an electric dipole. The magnitude of the dipole is determined by the product of the charges and the distance between them.
- Magnets: A permanent magnet, such as a bar magnet, exhibits a magnetic dipole moment due to the intrinsic magnetic dipole moment of its electrons. This is similar to electric dipoles, with the two ends labelled as "north" and "south" poles.
- Current Loop: A small current-carrying loop can approximate a magnetic point dipole. The magnetic dipole moment of such a loop is the product of the current flowing in the loop and the vector area of the loop.
- Electrons: Electrons possess a magnetic dipole moment, but it is not due to a current loop. Instead, it is an intrinsic property of the electron.
These examples illustrate the presence of electric dipoles in various physical and chemical systems, showcasing the significance of understanding electric dipole behaviour in different contexts.
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Frequently asked questions
An electric dipole is a pair of equal and opposite electric charges separated by a small distance.
The direction of an electric dipole is from the negative charge to the positive charge. This convention is only followed in physics. In chemistry, the direction is taken to be opposite, i.e., from positive to negative.
An electric dipole is denoted by the symbol "p".
The magnitude of an electric dipole is calculated by taking the product of either of the charges and the distance between them.
