Magnetic field and energy in solenoid?
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Posted by Paul | Posted in General | Posted on 07-03-2010
Tags: free energy, magnetic energy
Magnetic field and energy in solenoid?
MRI (magnetic resonance imaging) is a medical technique that produces detailed “pictures” of the interior of the body. The patient is placed into a solenoid that is 40 cm in diameter and 1.0 m long. A 100 A current creates a 5.0 T magnetic field inside the solenoid. To carry such a large current, the solenoid wires are cooled with liquid helium until they become superconducting (no electric resistance).
How much magnetic energy is stored in the solenoid? Assume that the magnetic field is uniform within the solenoid and quickly drops to zero outside the solenoid.
How many turns of wire does the solenoid have?
Thanks!
Batteryless Flashlights; Never Get Caught In The Dark Again
Batteryless Flashlights
As the name suggests a Batteryless Flashlight works without any requirement of batteries. One can also call it as the forever flashlight. These types of flashlights need to be shaken back and forth for few seconds and they will give light for many minutes, sometimes even hours. The main features of these Batteryless Flashlights are
1) Never needs any batteries or bulbs
2) Now with magnet and tether strap
3) Compact and water resistant.
Perhaps the biggest feature is that these flashlights are rechargeable at any time.
· Magnetic Batteryless Flashlights
The product Magnetic Batteryless Flashlight is the newest technology among the batteryless flashlights. One just has to shake the flashlights for 60 seconds and you will get up to 2 hours of light from this magnetic batteryless flashlight. These flashlights have three super bright LEDs which emit bluish white light that helps us in viewing clearly in the dark.
There is a high field strength magnet inside these flashlights, that slides back and forth inside a coil of copper wire, as we shake it to generate electric power. This power then gets stored in a small capacitor. The stored energy in the capacitor then powers the high brightness white-light LEDs.
It is prudent to turn the switch off at the time of shaking the flashlights for charging. If the switch is not turned off then pulse with the power spikes coming from the coil can be seen in the LEDs. The operating switch of these batteryless flashlights is durable and intrinsically safe. These flashlights lights are very light in weight and are completely designed to be waterproof. They are also fully portable.
· Dynamo type Batteryless Flashlights
Another type of batteryless flashlights is of dynamo type. These were the oldest technology among the batteryless flashlights. These types of flashlights have little fold-out cranks and we need to wind on for a while so that we can use the light again. In Dynamo type flashlights, by winding the cranks for a few minutes, a sector gear starts to move causing a tiny pinion gear to spin which drives a PM dynamo. The dynamo generates electrical energy which is used to light the LEDs in the batteryless flashlights. For years there have been dynamo types flashlights around that the world those work by squeezing a lever handle. Dynamo type battery free flashlights are quite reliable than the ordinary battery lights.
· Batteryless Flashlights review
The Batteryless flashlights are mainly used for emergency purpose. These flashlights sometimes come with built in FM radio. The main advantage of this Batteryless flashlight is that they are absolutely maintenance free. These flashlights can be stored for long periods of time without the worry of leaking batteries. In case of battery powered flashlights they often have their battery contacts loose & dbecome dysfunctional, but the batteryless flashlights don’t go dead as you are miles away from home late at night.
The main disadvantage about these batteryless flashlights is that they are not as bright as most other battery powered flashlights, but that’s a small price to pay as they are infinitely brighter than any other battery powered flashlights who’s batteries are drained of energy or their bulbs are broken or burned out.
Any person will realize that soon, there will be a global power crisis because the population is growing rapidly and yet the sources of energy are getting depleted just about as fast. There are many alternative ways to harness energy and yet many individuals are not doing anything to help. This is because these alternative sources of energy such as the wind mill and the solar panel are costly and difficult to maintain. The good news is that there is a new source of alternative source of energy that is rally of lesser cost: the magnet. The way this is harnessed is through the magnetic energy generator. This is not entirely new since it has been around for ten years.
The wonderful thing about this is that it can last up to hundreds of years. You must realize that solar panels and wind mills have short life span. The magnetic energy generator can last hundreds of years and there is not much maintenance needed. Wind mills and solar panels can also power up very little amount of appliances. The energy harnessed from the magnet can power up to 7,000 watts. Even if you have a big household, this amount of power can supply you with enough electricity. The only thing you have to worry about power is gasoline and fuel, not electricity.
Just imagine this: you do not have to rely on power corporations anymore just to have electricity. All you need to do is to have your own magnetic energy generator. You will no longer experience power outages and you will not have to pay outrageous fees for your electricity. Even if you have to spend on the machine, the amount of money you will save is incomparable to this little investment. If you do not want to buy the machine, you can build your own and all you need is a copy of the manual of the magnetic energy generator.
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Tags: free energy, magnetic energy
