Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
Applications : 1. Ferrite Cores 2. Magnetic Recording 3. Magnetic Shielding
with Example Solved Problems
Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
• Similar to capacitor, studied previously, inductor is also an energy storing element. In a capacitor, the energy is stored in the electrostatic field, while in an inductor energy is stored in the magnetic field. The energy stored by an inductor is given by,
Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
• Consider a rectangular loop with sides a and b as shown in the Fig. 8.11.1. A straight, long conductor is kept parallel to the longer side of the loop, along z-axis. A loop is kept at distance d from long conductor as shown.
Statement, Definition, Formula, Circuit Diagram, Solved Example Problems
Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
When two such coils are placed very close to each other, there exists a mutual inductance between the two. In this section, we will discuss the concept to self inductance and mutual inductance.
with Example Solved Problems
Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
• In general, in magnetic circuits, we determine the magnetic fluxes and magnetic field intensities in various parts of the circuits.The magnetic circuits are analogous to the electric circuits.
with Example Solved Problems
Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
• The conditions of the magnetic field existing at the boundary of the two media when the magnetic field passes from one medium to other are called boundary conditions for magnetic fields or simply magnetic boundary conditions.
Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
• We have already studied that in any magnetic material, the electrons revolve in the orbits around the positive central nucleus. Simultaneously the electrons also rotate or spin about their own axes.
Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
• In this section, we shall study the classification of the magnetic materials. Before actually starting with the classification, let us take a review of quantum theory in brief.
with Example Solved Problems
Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
• In the previous section we discussed the force on a current loop in a magnetic field. Let us now consider new quantity, magnetic torque.
with Example Solved Problems
Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
• While discussing the electrostatic fields, we have studied that a point charge exerts a force on another point charge, separated by distance R. If these charges are of same type (i.e. both positive or negative), then they repel each other.
Statement, Proof, Equation, Solved Example Problems
Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
• Practically a differential element of charge is made up of very large number of small and discrete charges. The volume thus occupied by these charge is obviously small but it is effectively greater than the average separation between charges.
Lorentz force equation, Definition, Formula, Solved Example Problems
Subject and UNIT: Electromagnetic Theory: Unit III: (b) Magnetic Forces, Magnetic Materials and Inductance
• Now consider that a charge is placed in a steady magnetic field. It experiences a force only if it is moving.