# What is the left-hand rule?

A left-hand rule is a tool used to determine the direction of the force acting on a current-carrying conductor placed in a magnetic field. The thumb of the left hand is pointed in the direction of the current flow, and the fingers of the left hand are then curled in the direction of the magnetic field. The direction in which the palm of the left-hand faces is the direction of the force acting on the conductor. The left-hand rule is often used in the study of electromagnetism and is particularly useful in understanding the behavior of electric motors.

### What is electromagnetism

Electromagnetism is the study of electromagnetic force, a type of physical interaction that occurs between electrically charged particles. The electromagnetic force is one of the four fundamental forces of nature, along with the strong and weak nuclear forces and the gravitational force. It is the force that is responsible for the interaction between charged particles, and it is the force that gives rise to a variety of phenomena, such as electricity, magnetism, and light.

In general, electrically charged particles experience a force when they are placed in an electric field or a magnetic field. The strength of the force depends on the charge of the particles and the strength of the field. Electromagnetism is the study of these forces and the ways in which they can be described and understood using mathematical models.

### What is the relationship between current, magnetic fields, and the forces acting on a conductor?

The relationship between current, magnetic fields, and the forces acting on a conductor is described by the left-hand rule, which is a tool used to determine the direction of the force acting on a current-carrying conductor placed in a magnetic field. According to the left-hand rule, if the thumb of the left hand is pointed in the direction of the current flow and the fingers of the left hand are curled in the direction of the magnetic field, then the direction in which the palm of the left-hand faces is the direction of the force acting on the conductor.

This relationship can be understood by considering the movement of charged particles in a conductor. When an electric current flows through a conductor, the charged particles in the conductor are arranged in a particular way, with some particles having a positive charge and others having a negative charge. In the presence of a magnetic field, these charged particles experience a force, and this force causes them to move in a particular direction. The direction of this force is determined by the left-hand rule.

### Unit of current, magnetic fields, and the forces

The unit of electric current is the ampere (A). The strength of a magnetic field is typically measured in units of tesla (T). The unit of force is newton (N).

Electric current is a measure of the flow of electric charge through a conductor. It is defined as the rate of flow of electric charge, with one ampere of current representing a flow of one coulomb of charge per second.

The strength of a magnetic field is a measure of the magnitude of the force experienced by a moving charge in the field. The tesla is the unit of magnetic field strength, and it is defined as the strength of the field required to produce a force of one newton on a charge of one coulomb moving at a speed of one meter per second perpendicular to the field.

Force is a measure of the interaction between two objects that are capable of exerting a push or pull on each other. It is defined as the product of an object’s mass and acceleration, and it is typically measured in newtons. One newton is defined as the force required to accelerate a mass of one kilogram at a rate of one meter per second squared.