![]() ![]() The opposition, resistance, to the induced current, induced by the magnetic field is called Inductive reactance and given by : Kindly note that, the negative sign which indicates the EMF is of opposite polarity to the applied voltage. ![]() Where ε is the electromotive force in volt, L is the inductor value in Henry and dl/dt is the rate of change of current with respect to time. This change in flux, induces an electromotive force (EMF) in the inductor which is given by : Any change in the electric current induced, changes the flux. Now let us continuously turn on and off the switch S, this is similar to applying alternating current. Where magnetic flux ø is the total number of magnetic lines and measured in SI unit Weber. ![]() The strength of this induced magnetic field is measured in magnetic flux density denoted by the letter B and the SI unit is wb/m 2. Now, if we reverse the polarity of the battery, the direction of the current changes, consequently poles of the electromagnet are reversed, and the direction of magnetic lines of force also gets reversed. And magnetic lines flow from N to S pole. This electromagnet has its North Pole, N, and South Pole, S, like a conventional magnet. When the switch S is turned on, current starts flowing through the inductor, a magnetic field is produced and the inductor becomes an electromagnet. Let us take a simple circuit as shown in Figure 2, where a battery is connected to an inductor L in parallel, and a switch S in series. It is denoted by the letter L and its SI unit is Henry, H.įigure 1 depicts the symbol of an inductor.įigure 1: Symbol of Inductor Working of Inductor It could be a tiny piece of straight copper wire or wire wound into rings called a coil.Īn inductor inherently opposes the change of current through it. What is an Inductor?Īn inductor is a two-pin passive component that stores energy in the form of a magnetic field when a current flows through it. Let us take a deep dive into the world of inductors. Inductors are vastly used from mobile, laptop chargers to high-end communication equipment like mobile base stations to the satellites orbiting the earth. ![]()
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