Sample Answer: The magnetic flux density through
a coil is directly proportional to current
. When the current increases the magnetic flux density will increase.
How does flux change with current?
Thus the magnetic flux through coil A changes with the current flowing through it. If you look at the formula for magnetic field then you will find that is the
directly proportional to the current
. So if the current increases the magnetic field of a current element increases and thus the magnetic flux increases.
How does current affect magnetic flux?
Current is
directly proportional to magnetic force
for a straight current carrying conductor in a uniform magnetic field. So the force is directly proportional to the size of the current. … If the current is increased by five times the force will also increase by five times.
What is the relation between magnetic flux?
The magnetic flux (often denoted Φ or Φ
B
) through a surface is the component of the magnetic field passing through that surface. In the most general form, magnetic flux is defined as
ΦB=∫∫AB⋅dA Φ B = ∫∫ A B ⋅ d A
. It is the integral (sum) of all of the magnetic field passing through infinitesimal area elements dA.
Is flux the same as current?
Fluxes and currents are
representations
. Any quantity that can be written as the surface intergral of a vector field is called the flux of that field through that surface. So, for instance, the electric current I, is the flux of the current density vector J.
Does current produce magnetic flux?
If we run an electric current through a wire,
it will produce a magnetic field around the wire
. In this case, your thumb points in the north direction of the magnetic field coming out of the center of the loop, while your fingers will point in the positive direction of the current in the loop. …
Does increasing current increase magnetic field?
The small magnetic fields caused by the current in each turn of the coil add together to make a stronger overall magnetic field. The strength of the magnetic field around a solenoid can be increased by:
increasing the number of turns on the coil
.
increasing the current
.
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.
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 does Faraday’s law state?
This relationship, known as Faraday’s law of induction (to distinguish it from his laws of electrolysis), states that
the magnitude of the emf induced in a circuit is proportional to the rate of change of the magnetic flux that cuts across the circuit
.
What is the symbol of magnetic flux?
In physics, specifically electromagnetism, the magnetic flux through a surface is the surface integral of the normal component of the magnetic field B over that surface. It is usually denoted
Φ or Φ
B
. The SI unit of magnetic flux is the weber (Wb; in derived units, volt–seconds), and the CGS unit is the maxwell.
What is SI unit of flux?
The SI base unit of electric flux is
voltmeters (V m)
which is also equal to newton-meters squared per coulomb (NM2C−1).
How magnetic flux is produced?
When a coil of wire is moved through a magnetic field a voltage is generated which depends on the magnetic flux
through the area of the coil
. … Electric motors and generators apply Faraday’s law to coils which rotate in a magnetic field as depicted in Figure 3. In this example the flux changes as the coil rotates.
Why flux is directly proportional to current?
Answer: The magnetic flux density inside a coil
will increase when
the number of turns increase. … Sample Answer: The magnetic flux density through a coil is directly proportional to current. When the current increases the magnetic flux density will increase.
What is flux density formula?
Flux density is simply
the total flux divided by the cross sectional area of the part through which it flows – B = Φ / A
e
teslas
. Thus 1 weber per square metre = 1 tesla. Flux density is related to field strength via the permeability. B = μ × H.
Can flux be negative?
The
negative flux just equals in magnitude the positive flux
, so that the net, or total, electric flux is zero. If a net charge is contained inside a closed surface, the total flux through the surface is proportional to the enclosed charge, positive if it is positive, negative if it is negative.
