# How do you find the magnitude of a magnetic flux?

## How do you find the magnitude of a magnetic flux?

ΦB=B⋅A=BAcosθ Φ B = B ⋅ A = BA cos ⁡ , where B is the magnitude of the magnetic field (having the unit of Tesla, T), A is the area of the surface, and θ is the angle between the magnetic field lines and the normal (perpendicular) to A.

## How do you calculate change in magnetic flux?

Magnetic flux F is defined by F=BA where B is the magnetic field or average magnetic field and A is the area perpendicular to the magnetic field. Note that for a given rate of change of the flux through the coil, the voltage generated is proportional to the number of turns N which the flux penetrates.

How do you calculate magnetic flux through a loop?

Calculate the change in magnetic flux through the circular 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) = 8.5×10-4 Tm2
3. Φ2 = B A cosθ = (.17 T)(0.0050m2)( 0 ) = 0 Tm2
4. Φ2 – Φ1 = 0 – 8.5×10-4 Tm2 = – 8.5×10-4 Tm2

How do you find the magnitude of the induced emf in a loop?

The magnitude of the induced EMF, |εind| is equal to |dΦB/dt|. If you need to find a current, you can frequently find it using Ohm’s Law, I = ε/R, where R is the resistance of the wire.

### Which case has maximum flux?

The electric flux of a surface is maximum when the area vector is parallel to the direction of the electric field. The electric flux is the total number of lines of force passing through a surface. Electric flux is proportional to the number of electric field lines going through a virtual surface.

### What is magnetic flux measured in?

Weber
Magnetic flux is a measurement of how many magnetic field lines pass through a certain area, and is measured in Weber in MKS units and Maxwell in CGS units.

What is the symbol for magnetic flux?

symbol Φ
Magnetic flux is denoted by the Greek letter Phi and has the symbol Φ or ΦB. Fluxmeter is used to measure magnetic flux.

What is the formula of 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.

#### How do you calculate magnetic flux examples?

Solution: magnetic flux is defined as the product of magnetic field, surface area, and the angle between B and a unit vector perpendicular to the surface with formula Φ m = B A cos ⁡ θ \Phi_m=BA\cos \theta Φm=BAcosθ.

#### What is the magnitude of the average emf in the loop?

(The plus and minus signs here refer to opposite directions through the loop.) Find the magnitude of the average induced emf in the loop during this time. The magnitude of the average induced emf is: emf = DF/Dt = (Fi – Ff)/Dt = (0.085T – (-0.057T))/1.5s = 0.095V = 95mV.

How do you find the current in a loop?

The loop equation can be used to find the current through the loop: I=VR1+R2+R3=12.00V1.00Ω+2.00Ω+3.00Ω=2.00A.

What happens when the magnetic flux through a wire changes?

If the magnetic flux through a loop of wire changes for any reason either by changing the area, A, of the loop or the field, B, through the loop Then an EMF (voltage) will be induced in the wire. This voltage will cause a current to flow (the induced current in the loop).

## How is current induced in a magnetic coil?

Lenz’s Law. The current that is induced in a coil (due to a magnetic flux change through the coil) will always be such that it opposes the change that caused it. Put another way: Any induced current in a coil will result in a magnetic flux that is opposite to the original changing flux.

## When does current flow through a loop of wire?

If the magnetic flux through a loop of wire changes for any reason either by changing the area, A, of the loop or the field, B, through the loop Then an EMF (voltage) will be induced in the wire. This voltage will cause a current to flow (the induced current in the loop).

Which is a measure of the strength of a magnetic field?

magnetic flux: A measure of the strength of a magnetic field in a given area. induction: The generation of an electric current by a varying magnetic field. As seen in previous Atoms, any change in magnetic flux induces an electromotive force (EMF) opposing that change—a process known as induction.