You are watching: When there is a change in the magnetic field in a closed loop of wire
inducing voltage by changing the magnetic field in loops of wireThe creation of voltage when a magnetic field changes with time. If the magnetic field within a closed loop changes in any way, a voltage is induced in the loop.
The induced voltage in a coil is proportional to the product of it"s numbers of loops, the cross-sectional area of each loop, and the rate at which the magnetic field changes within those loops. The greater the number of loops of wire that move in a magnetic field, the greater the induced voltage. When a magnet is plunged into a coil that has twice as many loops as another coil, twice as much voltage is induced. It is more difficult to push the magnet into a coil that has more loops because the magnetic field of each current loop resists the motion of the magnet.Loops produce magnetic field that is opposite of inserting magnet, thats why theres a resistance.
No. EMI is not a source of energy but a method of transforming mechanical energy into electric energy. Work must be done to produce energy by EMI.
The amount of current produced by electromagnetic induction depends not only on the induced voltage but also on the resistance of the coil and the circuit to which it is connected.
Ex: we can plunge a magnet in and out of a closed loop of rubber and in and out of a closed loop of copper. The voltage induced in each is the same, provided that the loops are the same size and the magnet moves with the same speed. But the current in each is quite different. Electrons in the rubber sense the same electric field as those in the copper, but their bonding to the fixed atoms prevents the movement of charge that so freely occurs in copper.
What happens when a magnetically stored bit of information on a computer disk spins under a reading head that contains a small coil?
The changing magnetic field in the coil induces voltage. In this way, information stored magnetically on the disk is converted to electrical signals.
If you push a magnet into a coil connected to a resistor, you"ll feel a resistance to your push. Why is this resistance greater in a coil that has more loops?
More work is required to provide more energy to be dissipated by more current in the resistor. You can also look at it this way: when you push a magnet into a coil, you cause the coil to become a magnet (an electromagnet). The more loops there are in the coil, the stronger the electromagnet that you produce and the stronger it pushes back against the magnet you are moving. If the coils electromagnet attracted your magnet instead of repelling it, energy would be created from nothing and the law of energy conservation would be violated.
When one end of a magnet is repeatedly plunged into and back out of a coil of wire, the direction of the induced voltage alternates.
As the magnetic field strength inside the coil is increased (as the magnet enters the coil), the induced voltage in the coil is directed one way. When the magnetic field strength diminishes (as the magnet leaves the coil), the voltage is induced in the opposite direction. The frequency of the alternating voltage that is induced equals the frequency of the changing magnetic field within the loop.
An electromagnetic induction device that produces electric current by rotating a coil within a stationary magnetic field. A generator converts mechanical energy into electrical energy.
The construction of a generator is, in principle, identical to that of a motor. They look the same but the roles of input and output are reversed.
In a motor, electric energy is the input and mechanical energy is the output; in a generator, mechanical energy is the input and electric energy is the output. Both devices simply transform energy from one form into another.
Moving electrons experience a force that is mutually perpendicular to both their velocity and the magnetic field they transverse.
When charge moves along the wire, there is a perpendicular upward force on the charge. since there is no conducting path upward, the force on the charge tugs the wire upward.
When a wire with no initial current is moved downward, the charge in the wire experiences a deflecting force perpendicular to its motion. there is a conducting path in this direction so the charge moves, constituting a current.
As a loop rotates, the induced voltage (and current) changes in magnitude and direction. One complete rotation of the loop produces one complete cycle in voltage (and in current).
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- a voltage is induced in the wire- a current in created in the loop of wire- electromagnetic induction occurs
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