It is the change in magnetic field that creates the current. Closing and opening the switch induces the current. Interestingly, if the switch remains closed or open for any length of time, there is no current through the galvanometer. (You can also observe this in a physics lab.) Each time the switch is opened, the galvanometer detects a current in the opposite direction. It was found that each time the switch is closed, the galvanometer detects a current in one direction in the coil on the bottom. The galvanometer is used to detect any current induced in the coil on the bottom. When the switch is closed, a magnetic field is produced in the coil on the top part of the iron ring and transmitted to the coil on the bottom part of the ring. The apparatus used by Faraday to demonstrate that magnetic fields can create currents is illustrated in Figure 1. Describe methods to produce an electromotive force (emf) with a magnetic field or magnet and a loop of wire.Calculate the flux of a uniform magnetic field through a loop of arbitrary orientation.It can be a measure of how much magnetic field the surface under consideration is exposed to. This calculated magnetic flux value, if changes with time, could induce an electromotive force in a coil as per Faraday’s law of electromagnetic induction. So, the magnetic flux Φ through the given surface area is 2 Weber. Calculate: Plug the values of B and A into the equation.Since the magnetic field is perpendicular to the area, the dot product simplifies to the multiplication of the magnitudes. Apply the magnetic flux equation: According to the magnetic flux equation, Φ = B.Identify the values: In this case, B = 2 T and A = 1 m 2.Let’s consider a simple scenario where a uniform magnetic field (B) of strength 2 Tesla (T) is passing perpendicular through a square area (A) of size 1 square meter (m 2). Its applications extend across a myriad of devices and technologies that form the basis of modern life. Understanding the concept of magnetic flux and its equation is vital in electromagnetic theory and in the field of electrical engineering. The design of these devices depends significantly on controlling magnetic flux. It is indispensable in the functioning of transformers, inductors, electric motors, and generators. Magnetic flux plays a critical role in various electrical and electronic devices. The negative sign represents Lenz’s Law which states that the induced emf and the change in flux have opposite directions. This law is stated as: emf = -dΦ/dt, meaning that the emf induced in a circuit is equal to the rate of change of magnetic flux through the circuit. It can also be expressed in other units like Maxwell, where 1 Weber equals 10 8 Maxwells.įaraday’s Law of electromagnetic induction, which relates changes in magnetic flux to electromotive force (emf), highlights the significance of magnetic flux in electromagnetism. In the International System of Units (SI), magnetic flux is measured in Weber (Wb). The dot product means that only the component of the field that is perpendicular to the surface is considered. The magnetic flux (Φ) through a surface is calculated by the surface integral of the magnetic field (B) over an area (A). It measures the total magnetic field that passes through a given area. Magnetic flux, represented by the Greek letter Phi (Φ), is a fundamental concept in electromagnetism. Explore the fundamentals of magnetic flux, its equation, unit, significance in electromagnetism, and an example of flux calculation.
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