Define Faraday's law?

Answer 1

It's when a magnetic field cuts a conductor, or when a conductor cuts a magnetic fiel, an electric current will then flow into the conductor if a closed path is provided over which the current can circulate. It also means that two other laws relate to electrolytic cells.

Answer 2

Define Faradays Law

Answer 3

Faraday's Law Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. No matter how the change is produced, the voltage will be generated. The change could be produced by changing the magnetic field strength, moving a magnet toward or away from the coil, moving the coil into or out of the magnetic field, rotating the coil relative to the magnet, etc. Further comments on these examples Faraday's law is a fundamental relationship which comes from Maxwell's equations. It serves as a succinct summary of the ways a voltage (or emf) may be generated by a changing magnetic environment. The induced emf in a coil is equal to the negative of the rate of change of magnetic flux times the number of turns in the coil. It involves the interaction of charge with magnetic field. Lenz's law AC coil example Faraday's Law and Auto Ignition Index Faraday's Law concepts HyperPhysics*****Electricity and magnetism R Nave Go Back

Answer 4

...faradays law of electrolysis is as follows......(physical chemistry) The amount of any substance dissolved or deposited in electrolysis is proportional to the total electric charge passed. The amounts of different substances dissolved or desposited by the passage of the same electric charge are proportional to their equivalent weights.

faradays law of induction is as follows..... Faraday's Law of Induction.
Generating (or inducing) a voltage (or emf) with a changing magnetic field.



or: the emf induced in a circuit is proportional to the rate of change of the magnetic flux through the circuit. This emf, or voltage can push a current around the circuit if it is a closed circuit, or can be seen with a volt meter if the circuit is not closed.

Things to note:

1) You must know what flux is (the number of field lines piercing the area.) and how to calculate it.



which can be written as


if (and only if) the field (B) is constant over the region in question. (Make sure you know what qis!)

2) N is the number of 'turns', and just counts the number of times the circuit winds around. An effective way to increase the effective area.

3) The minus sign (Lenz's Law) is put in to remind you to get the direction of any induced current correct (or to get the 'plus' and 'minus' correct for the emf.)

The correct direction is to oppose change.

Looking at the equation we see that there are many ways to change the flux. Change the field, change the area change the angle, or some combination of all three. Note that if the angle is changing you will have to know how to differentiate cos.

Problems you will have to solve using Faraday's law will involve finding a voltage, current (or sometimes total charge flow) when something changes. The something will be one of the 3: B, A or q . B can change by moving a magnet closer or further away, or, if the B is being created by a current in another circuit, by altering this current. A can change by changing the size of the loop, or just the area through which the field is passing. q is changed by rotating the loop with respect to the field.

One important thing to note is that for any circuit, if we try to change the current (by, for example, switching it on or off!) then we must change the magnetic field (recall that currents create fields) and so we will cause a change in the flux. This will then cause a voltage to be developed in the circuit opposing the change. Some times circuit designers want this, and sometimes they don't. One thing to notice is that the fields created are proportional to the current flowing (see equations 22.14, 22.16, 22.24, 22.25, etc.), and so the flux is proportional to the current flowing.



The proportionality constant, L, is called the (self) inductance and can often be calculated from equations like 22.14, 22.16, 22.24, 22.25 combined with the definition of flux. (Note the factor of N in the above equation. Some people put it here, some absorb it into L, the only requirement is that you get the correct answer. Don't forget the N and don't double count it!)

Combining the definition of L with Faraday's law gives a very practical equation:

.

(Practical as voltages and currents are easily measured in the lab.)

As stated earlier, sometimes one wants 'inductance' in circuits and the best way to do this is to put a wire with many turns in it into the circuit. This is call an inductor.

Kirchhoff's rules still apply to circuits with inductors in them, and one can apply these rules to any given circuit to find the (differential) equation that the current obeys.

A couple of rules of thumb may help:

1) Inductors 'react' to change and so act like open circuits when initially asked to carry current. (initially no current, lots of voltage)

2) However, in the steady state (when things are not changing), as inductors are nothing more than loopy wires, they simply act like closed circuits (allowing the free flow of current with no voltage drop.)

Try a couple of simple L-R-V circuits: Example 23.8

We have spoken of energy and power delivered by a battery and dissipated by a resistor. By doing an energy sum, one can find the energy stored in an inductor:



Note that if the inductor is carrying no current, it is holding no energy. It is also creating no field. We sometimes say that the energy is actually stored in the field. A simple calculation for a solenoid leads to the following energy stored in a magnetic field, per unit volume:


i can tell only these 2

Answer 5

The magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. No matter how the change is produced, the voltage will be generated. The change could be produced by changing the magnetic field strength, moving a magnet toward or away from the coil, moving the coil into or out of the magnetic field, rotating the coil relative to the magnet.It is a fundamental relationship which comes from Maxwell's equations. It serves as a succinct summary of the ways a voltage may be generated by a changing magnetic environment. The induced emf in a coil is equal to the negative of the rate of change of magnetic flux times the number of turns in the coil. It involves the interaction of charge with magnetic field.


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