# What is the magnetic force on the moving bar?

## How do you solve for induced emf?

The emf induced in a circuit is directly proportional to the time rate of change of the magnetic flux through the circuit. Assume a loop enclosing an area A lies in a uniform magnetic field. = BA cos θ. The induced emf is ε = – d/dt (BA cos θ).

## How do you determine the direction of induced current?

The central finger points in the direction of induced current in the conductor if the thumb and forefinger point in the direction of the conductor’s velocity and magnetic field, respectively.

## How do you calculate induced emf with resistance?

Then use Ohm’s law as : V=I⋅R⟹I=ϵR V = I ⋅ R ⟹ I = ϵ R , where ϵ is the electromotive force obtained from Step 2, R is the resistance of the coil and I is the current induced in the coil.

## What is the magnetic field formula?

F=ILBsinθ where θ is the angle between the wire and the magnetic field. The force is perpendicular to the field and the current. The equivalent formula for the force on a moving charged particle of charge q and velocity v is F, equals, q, v, B, sine, theta,F=qvBsinθ, with the force perpendicular to field and velocity.

## What is Q in magnetic field?

The equation is given by F = q v × B or F = qvB sin θ, where q is the charge, B is the magnetic field, v is the velocity, and θ is the angle between the directions of the magnetic field and the velocity; thus, using the definition of the cross product, the definition for the magnetic field is.

## Is emf the same as voltage?

Electromotive Force (EMF) This is represented by “ε” and the unit of measurement is the same as voltage, which is Volt. EMF is the maximum potential difference between two points of the battery when no current flows from the source in the case of an open circuit.

## Is emf the same as magnetic flux?

As seen in previous Atoms, any change in magnetic flux induces an electromotive force (EMF) opposing that change—a process known as induction. Motion is one of the major causes of induction. For example, a magnet moved toward a coil induces an EMF, and a coil moved toward a magnet produces a similar EMF.

## How do you tell if current is clockwise or counterclockwise?

Point your thumb out and curl your fingers. Your fingers should be pointing at you. This is the direction of the electric field when electrons are traveling the direction of your thumb.

## How do you find the direction of induced current using Fleming’s right hand rule?

If the forefinger points in the direction of magnetic field, thumb in the direction of motion of the conductor, then the central finger points in the direction of induced current in the conductor.

## How do you use Faraday’s Law?

The magnitude of the induced emf can be calculated using Faraday’s law. The magnetic field inside the long coil is B = μ0(N/ℓ)I. The flux through the coil is NBA = μ0(N2/ℓ)IA. The change in flux per unit time is μ0(N2/ℓ)A ∆I/∆t = L*∆I/∆t, since I is the only quantity changing with time.

## Is induced current the same as emf?

It is the changing field that produces the current. The current in the coil is called the induced current because it is brought about by a changing magnetic field. Since a source emf is always needed to produce a current, the coil behaves as if it were a source of emf. This emf is known as the induced emf.

## How do you find the emf of a circuit?

The emf is equal to the work done on the charge per unit charge (ϵ=dWdq) when there is no current flowing. Since the unit for work is the joule and the unit for charge is the coulomb, the unit for emf is the volt (1V=1J/C).

## How do you calculate magnetic moment?

μ=n(n+2) where n= Number of unpaired electrons.

## How do you find the force of a magnetic field?

F = qv × B. The force F is perpendicular to the direction of the magnetic field B. It also is perpendicular to the direction of the velocity v.

## What does Lorentz law state?

The Lorentz force law states that a magnetic field exerts a force on a moving ionic current. 3. The Hall effect further states that when a magnetic field is placed perpendicular to the direction of flow of an electric current, it will tend to deflect and separate the charged ions.

## What is Ampere’s law used for?

Ampere’s Law is used to : Determine the magnetic induction due to a long current-carrying wire. Determine the magnetic field inside a toroid. Determine the magnetic field created by a long current carrying conducting cylinder.

## What do u mean by Lorentz force?

Lorentz force, the force exerted on a charged particle q moving with velocity v through an electric field E and magnetic field B. The entire electromagnetic force F on the charged particle is called the Lorentz force (after the Dutch physicist Hendrik A. Lorentz) and is given by F = qE + qv × B.

## How do you calculate emf when changing magnetic field?

Calculating the induced EMF Faraday’s law states: Induced EMF is equal to the rate of change of magnetic flux. Magnetic flux = Magnetic field strength x Area = BA. Therefore…Induced EMF = (change in Magnetic Flux Density x Area)/change in Time. Therefore, Induced EMF = (Bπr2n)/t.

## How are emf and magnetic flux related?

The induced emf in a coil is equal to the negative of the rate of change of magnetic flux times the number of turns in the coil. It involves the interaction of charge with magnetic field.

## Is emf the derivative of flux?

Stated in words: the derivative of the flux of magnetic field through a surface is proportional to the electromotive force around its boundary (which is the circulation integral of the electric field around it).

## Is EMF a force or energy?

Electromotive force is the characteristic of any energy source capable of driving electric charge around a circuit. It is abbreviated E in the international metric system but also, popularly, as emf. Despite its name, electromotive force is not actually a force.