## What is the magnetic flux through the loop?

The magnetic flux is a measure of the number of magnetic field lines passing through an area. If a loop of wire with an area A is in a magnetic field B, the magnetic flux is given by: If the flux changes, an emf will be induced.

## Which describes the magnetic flux through a section of a loop?

Which describes the magnetic flux through a section of a loop? It is a vector that is directed outward through the section. … When the magnetic field is perpendicular to the section’s area vector. When the magnetic field is in the direction of the section’s area vector.

## How do you find the magnetic flux through a loop?

1. Solution: A = π R2 = π ( .040m)2 = 0.0050 m2 When the loop is horizontal, θ = 0, and the flux is.
2. Φ1 =BAcosθ =(0.17 T)(0.0050m2)(1) = 8.5×104 Tm2
3. Φ2 = B A cosθ = (.17 T)(0.0050m2)( 0 ) = 0 Tm2
4. Φ2 – Φ1 = 0 – 8.5×104 Tm2 = – 8.5×104 Tm2

## What is induced when the magnetic flux through the loop changes?

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 does Loop area affect magnetic flux?

Faraday’s Law says that the emf induced (and therefore the current induced) in the loop is proportional to the rate of change in magnetic flux: … In a coil of wires, each loop contributes an area A to the right-hand side of the equation, so the induced emf will be proportional to the number of loops in a coil.

## Does Loop area affect the current flow?

The loop area effects the flow of current. So, if we decrease the loop area will are increasing the flow of current, while increasing the loop area will decrease the flow of current. . 4.

## Which describes the magnetic field lines of a current loop?

Which describes the magnetic field lines of a current loop? They extend toward the loop on one side and away from the loop on the other side.

## What is true about a solenoid?

A solenoid (/ˈsoʊlənɔɪd/,) is a type of electromagnet, the purpose of which is to generate a controlled magnetic field through a coil wound into a tightly packed helix. The coil can be arranged to produce a uniform magnetic field in a volume of space when an electric current is passed through it.

## Which is true about the emf induced in a loop by a magnet?

Which is true about the emf induced in a loop by a magnet? It is equal to the inverse of the magnetic flux through the loop. It is equal to the inverse of the rate at which the magnetic flux through the loop changes. … A loop lies in a magnetic field, with the field perpendicular to the plane of the loop.

## Why is emf max when flux is zero?

As the coil turns and the plane of the coil becomes parallel to the field lines, the flux becomes zero. … By Faraday’s law, the magnitude of the induced emf is equal to the rate of change of magnetic flux, so its maximum values occurs when the flux curve has its greatest slope.

## Why is Faraday’s Law negative?

The negative sign in Faraday’s law comes from the fact that the emf induced in the coil acts to oppose any change in the magnetic flux. … Lenz’s law: The induced emf generates a current that sets up a magnetic field which acts to oppose the change in magnetic flux.

## How do you find flux?

Find the flux of F=yˆj−zˆk through the paraboloid S=y=x2+z2,y≤1. The flux can be described by ∬SF⋅ndσ with n=2xˆi−ˆj+2zˆk√1+4×2+4z2. Substitute x2+z2=y to simplify n to −1+2z2y.

## Can you have negative magnetic flux?

Yes, magnetic flux can be negative. It just depends on where the field is going. Say there is a sheet and magnetic field is going through it from front to the back, we can call the flux there as positive and negative when it’s the other way round.

## What is a motional EMF?

An emf induced by motion relative to a magnetic field is called a motional emf. This is represented by the equation emf = LvB, where L is length of the object moving at speed v relative to the strength of the magnetic field B.

## What increases magnetic flux?

There are three ways to change the magnetic flux through a loop: Change the magnetic field strength (increase, decrease) over the surface area. Change the area of the loop (increase by expanding the loop, decrease by shrinking the loop)