How is magnetic flux calculated?

The magnetic flux (often denoted Φ or ΦB) 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.

What is flux in coax cable?

The magnetic field lines inside a coaxial cable form circles concentric with the inner conductor. To determine the flux we define a strip of area dA = l dr. We determine the total flux by integrating Bl dr from the radius of the inner conductor to the radius of the outer conductor.

What is magnetic flux formula and unit?

The magnetic field vector B is defined by the force it would apply to a charge moving in it. B = F/qv, so the units are (N *s) / (C *m), which we call a Tesla, or T. This is also called flux density. Flux is then given by B*A, so it is in T*m^2, which we also call a Weber.

What two ways can coaxial cables be used?

Applications. Coaxial cable is used as a transmission line for radio frequency signals. Its applications include feedlines connecting radio transmitters and receivers to their antennas, computer network (e.g., Ethernet) connections, digital audio (S/PDIF), and distribution of cable television signals.

What is source of capacitive noise in coaxial cable?

The end-to-end resistance of the shield, when excited by the large common-mode currents that can be induced by RFI, creates a small residual voltage from end to end across the cable shield. This residual voltage appears to the receiver as a source of noise.

How do you calculate magnetic?

The Biot-Savart Law can be used to determine the magnetic field strength from a current segment. For the simple case of an infinite straight current-carrying wire it is reduced to the form B=μ0I2πr B = μ 0 I 2 π r .

Is there magnetic field outside a coaxial cable?

Well, if i sub a is equal to i sub b, if these two currents, that they’re equal in magnitude since they’re flowing in opposite directions, then i enclosed is going to be equal to 0. It means that magnetic field outside of the coaxial cable will be 0 for r greater than c region.

Why do we calculate flux?

It is a useful tool for helping describe the effects of the magnetic force on something occupying a given area. The measurement of magnetic flux is tied to the particular area chosen. We can choose to make the area any size we want and orient it in any way relative to the magnetic field.

How is the magnetic field calculated in a coaxial cable?

Coaxial cable is a basic and most widely used transmission line in which the magnetic field is calculated using Ampere Law. In coaxial cable, the magnetic field is calculated by considering four different cases. Magnetic field in a coaxial cable can be calculated using ampere law and by considering four different cases.

What are the characteristics of coaxial cable?

A coaxial cable consists of an inner solid conductor of radius , and and outer conducting cylindrical shell of inner radius and outer radius In both conductors, the current equals , but they are in opposite directions. Also, the current distribution is not uniform, it increases linearly with distance from the central axis.

Where are the conductors located in a coaxial cable?

These cases are inside the inner conductor, inside the space between two conductors, inside the thickness of outer conductor, outside the outer conductor. A coaxial cable consists of two conductors; one is inner conductor made up of either copper or aluminum and an outer conductor of metal foil. Both the conductors are separated by an insulator.

What happens when the magnetic field inside the conductor is zero?

By ampere law, at this point positive current flowing inside the inner conductor is enclosed with the negative current flowing inside the outer conductor. This will get cancelled by each other, and the magnetic field at this point will become zero. Where H = magnetic field outside the outer conductor.