This is a question on the phase difference between an a.c., the resulting magnetic flux and the induced emf.?
454387
from my knowlege the emf is opposite of the direction of change of flux and the difference between ac, emf is the phase constant. for example if emf is vertical ac is 90degrees-phase constant
590620
The difference lies in the nature of the fields. The electric fields can affect every charged particle whether it is static or moving but magnetic field can affect it only if its moving that even not along the magnetic field lines. The force due to electric field follows F=qE and is in the direction of the field itself whereas the magnetic force follows F=q(vxB) and is in the perpendicular direction to the magnetic field and thus causes the charge particle to gyrate around the field lines. Moreover the work done by a magnetic force is zero unlike in the case of an electric force.
202486
E(sub l) = L(di/dt). \ni is the varying current through the circuit during transient period or in AC circuit.\nif it's DC, E(sub l) will be equal to 0 after some time..
630572
Whenever there is a change in the magnetic field.. It will induces an current in the near by object which changing the field.. This is called electromagnetic induction
942587
poorcocoboiboi is correct, however the electric field is still there even after the charge is moving. In fact it is the moving electric field that produces the magnetic field.
544765
The difference is that the pipe allows for complete current loops around the circumference of the pipe, which will generate a magnetic field in opposition to the falling magnet.  In a coil, with the ends disconnected, you won't have this happening.  You induce some emf in the coil, but it's not a closed circuit, or at least not one that can generate a magnetic field opposing the falling magnet.  You could consider small current loops induced within the wire, or around the circumference of the wire, depending on the magnet's orientation, but these will be small and weak compared to a current loop all the way around a pipe.  However, if you wire one end of the coil to the other,  you should get some Lenz's law braking of the magnet.   \n\nIt's a very clever idea for a demonstration.  I had to go set it up and test it myself with some magnet wire wound around a glass tube and a glass tube sheathed in a copper pipe, to see the effect you described.  Like I said, if you connect the coil to itself, you will see some effect, but it's not nearly as strong as the copper tube.  I think this is because the emf is induced in the coil as a whole, and not as a local loop as in the pipe, so you have a field of the same total strength, but it's not as strong locally. I think I'm going to have to play around with this some more and maybe do some actual math to figure out the full details.
367740
You already have B.  Calculate A from the dimensions given.  This will give you the flux.  Divide that by area of a circle of radius 2 cm to get your answer.\n\nAlso, I don't know if this will help, but there's a specific equation for the magnetic field of a solenoid:  B(solenoid) = (MUo)(N1/l)(I)  [MU=the Greek letter that looks like an M, and o is a subscript zero]  That last character is a capital I and the one before that is a small L.
777999
The voltage in alternating current oscillates up and down above and below zero, ideally with an average voltage of zero. Now using sense you could describe the voltage as zero, but this would not describe the signal properly; you need to know where you are on the wave (picture a sin wave) to know what the voltage is at a particular instant. A system called phase is used for this, describing how far you are into the wave pattern by degrees. The distance (in time) from one wave crest to the next is 360 degrees for example. An alternating system is ony fully described by magnitude AND phase. A three phase system actually has three waves equally spaced (120 degrees apart).
303378
Hi,\n\nYou know that if electricity is apllied to a coil over a magnet it causes mechanical movement due to the formation of magnetic fields similarly the converse is also true\nthat if mechanical energy is applied to a similar but reverse arrangement electricity can be produced\n\n\nwhen current flows magnetic fields are induced but if a fluctuating magnetic field forms in a ciol electricity is induced
482358
I admire mathematician's concise answers, but in this case some additional explanation may be due:\n\nWhen a wave is partially transmitted and partially reflected the two outgoing waves are shifted in phase from the incident wave. If energy or probability is to be conserved, the difference between the two phase shifts is pi/2 (90°). In this diagram each of the two possible outgoing  beams consist of components from two paths (R=Reflection,T=Transmission):\n\nOutgoing Horizontal: TRR + RRT\nOutgoing Vertical: TRT + RRR\n\nIn the first case the relative phase shift between the two components is 0 and in the second case it's pi (180°) ==> the two components are negatives of each other and interfere destructively.
731450
Faraday's law of Electromagnetic induction: refer http://en.wikipedia.org/wiki/Electromagnetic_induction\n\nThermodynamic processes: refer http://en.wikipedia.org/wiki/Thermodynamics
1172658
Actually it's a question in physics. I will try to explain it anyway:\nassume we have two windings w1 and w2 with  n1 rounds and n2 rounds respectively. If an A.C. voltage of V1 is connected to w1 then a voltage V2 will be induced in w2, satisfying the following equation:\nV1/V2=n1/n2 and for currents we have: I1/I2=n2/n1\nand it doesnt convert ac to dc to do so we should use a rectifier such as bridge rectifier etc
311263
The answer is B.  Its Faraday's law of magnetic induction.  As the loops are brought closer to each other, the magnetic field from one loop to another increases, increasing the flux.  The loops will want to counter this increase in flux, creating a back EMF that will oppose the original current.  This reduces the current in each loop.
738961
Sorry, you're going to have to be a bit more specific than that. Electromagnetics is a rather broad subject.\n\n~X~
319281
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.
539149
A bit rusty, but here it goes - I beleive they subtract fro m the net magnetization. If some of the ions are anti-aligned it is called ferrimagnetic. If the ions anti-align completely it is called antiferrmagnetic.
819160
em energy radiated is proportional to T^4, so it would be : ((273.15+9627)/ (273.15+5227))^4 =10.5