^Eddy currents Opposing currents produced in the whole volume of a metallic body in the form of closed loops due to the change in magnetic flux linked with a body oppose the change in magnetic flux & can be so strong that the metallic body become red hot.
^Combination of inductors
^Coefficient of coupling (K) It is defined as, (A) The value of K is 0 < K < 1 for loose coupling (i.e. When the axis of two coils are parallel to each other & on different lines ) (B) K = 1 for tight coupling ( i.e. when two coils are wound on each […]
^Mutual induction (M) 1. Property of a coil due to which it suppress the variations in current in it by inducing a back EMF in the neighbouring coil is called mutual induction. It is measured by a quantity called mutual inductance (M), which is defined as, . 2. SI unit of both self & mutual […]
^Self induction 1. Property of a coil due to which it suppress the variations in current in it by inducing a back EMF in itself is called self induction. It is measured by a quantity called self inductance (L), which is 2. For a coil & long solenoid (a) self inductance, L = A l […]
^emf by changing area Diagram shows a rectangular loop of length L, breadth b, moved towards a region of uniform magnetic field B at a uniform velocity v. Due to change in magnetic flux with time the emf induced in the loop is, ε = B L v. This causes current (clockwise) in loop. Due […]
^Lenz rule Induced EMF produced in a circuit always flows in a direction so as to oppose its cause (i.e. change of magnetic flux).
^Electromagnetic induction Faraday discovered that a time-varying magnetic field produces an electric field more precisely time varying magnetic flux linked with a circuit induces an electric field in it. This field is non conservative & forms closed loops in the circuit in which it is induced (unlike electrostatic electric field, which never forms closed loop […]
^Commonly used results in electricity & magnetism Electricity Magnetism Source of field Static or moving charges Moving charges SI units Charge: coulomb (C)Electric field: Newton /coulomb (N/C) Magnetic pole: ampere meter (Am).Magnetic field is tesla (T) Field lines Discontinuous: Start at a + ve charge & end at equal -ve charge. Continuous: Have no start […]
^Comparative study of Dia, para & ferro Property Diamagnetic Paramagnetic Ferromagnetic Physical state Solid, liquid or gas Solid, liquid or gas Crystalline solids only Atomic dipole moments Zero permanent dipole moment Non – zero permanent dipole moments but oriented randomly Non – zero permanent dipole moments but organised in domains Effect of external mag. […]
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