Explanation
As the aircraft flies, magnetic flux changes through its wings due to the vertical component of the earth’s magnetic field. Due to this, induced e.m.f. is produced across the wings of the aircraft. Therefore, the wings of the aircraft will nor be at the same potential.
According to Lenz’s law, induced e.m.f. arc in a direction such as to attempt to maintain the original magnetic flux when a change occurs. When the switch is opened, the sudden drop in the magnetic field in the circuit induces an e.m.f. in a direction that attempts to keep the original current flowing. This can cause a spark as the current bridges the air gap between the poles of the switch. (The spark is more likely in circuits with large inductance).
Mutual inductance is the phenomenon according to which an opposing e.m.f. produces flux in a coil as a result of change in current or magnetic flux linked with a neighboring coil. But when two coils are inductively coupled, in addition to induced e.m.f. produced due to mutual induction, induced e.m.f. is also produced in each of the two coils due to self-induction.
Lenz’s law is based on conservation of energy and induced e.m.f. always opposes the cause of it, i.e., change in magnetic flux.
When the satellite moves in inclined plane with equatorial plane (including orbit around the poles), the value of magnetic field will change both in magnitude and direction. Due to this, the magnetic flux through the satellite will change and hence induced currents will be produced in the metal of the satellite. But no current will induced if satellite orbits in the equatorial plane because the magnetic flux does not change through the metal of the satellite in this plane.
Efficiency o electric motor is maximum when the back e.m.f. set up in the armature is half the value of the applied battery e.m.f.
When a metal piece falls from a certain height then eddy currents are produced in it due to earth’s magnetic field. Eddy currents oppose the motion of piece. Hence metal piece falls with a smaller acceleration (as compared to g). But no eddy currents are produced in non-metal piece. Hence it drops with acceleration due to gravity. Therefore non-metals piece will reach the earth’s surface earlier.
Transformer works on ac only, ac changes in magnitude as well as in direction.
Hysteresis loss in the core of transformer is directly proportional to the hysteresis loop area of the core material. Since soft iron has narrow hysteresis loop area, that is why soft iron core is used in the transformer.
AC generator is based on the principle of the electromagnetic induction. When a coil is rotated about an axis perpendicular to the direction of uniform magnetic field, an induced e.m.f. is produced across it.
With rise in current in coil A flux through B increases. According to Lenz’s law repulsion occurs between A and B.
Crosses (x) linked with the loop arc decreasing, so induced current in it is clockwise, i. e., from B → A. Hence, electrons flow from plate A to B so plate A becomes positively charged.
The energy of the field increases with the magnitude of the field. Lenz’s law infers that there is an opposite field created due to increase or decrease of magnetic flux around a conductor so as to hold the law of conservation of energy.
The magnitude of induced e.m.f. is directly proportional to the rate of change of magnetic flux. Induced charge doesn’t depend upon time.
According to Lenz's law
E.m.f is induced in the ring and it opposes the motion. Hence due to the resistance of the ring all energy dissipates.
E.m.f. or current induces only when flux linked with the coil changes.
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