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4. Alberto is studying how the number of coils in an electromagnet's solenoid affects the strength of the magnet. He recorded his results in the table below. Number of Coils Number of Paper Clips Pick?
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Why is a iron bar placed in a solenoid?
Solenoids operate by means of electro-magnetic force when a current is passed through them. Iron is easily magnetised and is the only choice for the core.
What are two primary differences between an electromagnets magnetic field and earths magnetic field?
First one is artificial where as the latter is natural We could increase or decrease the strength of magnetic field but we cannot vary earth's Intense field could be produced but earth's field is feeble in comparison with artificial
Why is iron nail used to make an electromagnet?
because exhibits maximum flux density requires small magnetising field exhibits low hysteresis loop
Why is it possible to see the cone vibrating in a loudspeaker?
A loudspeaker uses electromagnets. An electromagnet consists of an iron centre which has coils of wire tightly wrapped round it. This is known as a solenoid. When the current flows through the wires of the solenoid it produces a magnetic field round it. the iron core increases the strength of the magnetic field. A solenoid can behave like a normal bar magnet, with a north and south pole. Which is north and which south depends on the way the electricity goes through. When the electricity stops, the magnetism stops too. Electromagnets are useful because their magnetism can be turned on and off by turning the electricity supply on and off. To understand how a loudspeaker works, it is best to start with a microphone. A microphone turns sound into electricity. A microphone has grains of carbon behind a disc. Wire carrying electricity is connected to the carbon. When someone speaks into a microphone, this makes sound waves, which make the disc tremble. When the disc trembles, it pushes the grains of carbon in and out slightly. This movement affects the strength of the electricity in the wire. Loud noises move the disc most and cause the biggest change in electricity. Soft sound hardly move the disc at all and cause only a weak change. Speaking into a microphone sends a changing electric current along its wire. Earphones turn the changing electric current back into sound waves. There is an electromagnet in the earphone which has a metal disc in front of it. Different strengths of electricity make the magnetism weaker or stronger. the changes in magnetic strength make the disc tremble, which makes sound waves in the air. These are an exact copy of the sound waves that went into the microphone, and so an exact copy of the sound is heard. In the case of loudspeakers, the sound waves can be made extra clear by joining the metal disc to a cone of cardboard. The whole cone trembles when the disc does. This moves more air and makes clearer and louder sound waves. Radios, cassette and CD players all have loudspeakers inside them.
What has a wire-wrapped core?
A coil of wire or a coil in the shape of a cylinder is a typical shape for an electromagnet (or a solenoid). The strength of the magnetic field of an electromagnet can be increased significantly if the coil is wrapped around an iron core. This configuration may be called an inductor when used as an element of an electrical circuit.
How could you increase the strength of a solenoid?
by increasing the number of turns of solenoid........
Do electromagnets lose strength?
Only once the electricity is switched off.
Can increase the strength of an electromagnets field by?
using a stronger ferromagnetic material for the core. :)
Which factors affect the magnetic strength of a solenoid which is carrying an electric current?
Factors affecting the magnetic field strength of a solenoid are: - length of the solenoid - diameter of the solenoid - current through the coil around the solenoid - number of turns of the coil of current around the solenoid, usually turns of wire - material in the core
What are some ways to increase the magnetic field strength?
Increase the size of the magnet. Increase the current passing through the wires (electromagnets) Increase the number of coils of the wire (electromagnets)
Will increasing the number of loops in a solenoid cause the strength of its magnetic field to decrease?
No; increasing the number of loops in a solenoid will cause the strength of its magnetic field to increase.
What is the difference between electromagnet and solenoid?
A solenoid is a coiled wire with an electric current running through it, causing a magnetic field. An electromagnet is almost the same thing except it is much stronger than a solenoid (usually) and, unlike a solenoid, has a soft, iron core.
How the strength of the electromagnets can be varied?
by increasing or decreasing the charge going through the coils or moving an iron core in and out of the coils.
Why is the strength of an electromagnet so much greater than the strength of a solenoid's magnetic field?
hi how are you to day? hi how are you to day?
What can be done with an electromagnet that cannot be done with a regular permanent magnet?
Its strength can be easily manipulated (e.g. you can switch it off). Or the strength can be varied with the current. Electromagnets can reverse polarity (by reversing the current).
Is a nine volt solenoid stronger than a three volt solenoid?
There's no set answer to that. The strength of the solenoid isn't decided by the voltage alone, so it'd be entirely possible to build them either way.
How the magnetic field around a solenoid can be strengthened?
The strength of the magnetic field produced by a current carrying solenoid depends on:The number of turns - larger the number of turns, greater is the magnetism produced.The strength of the current - when current increases, magnetism also increases.Nature of 'core-material' used in making the solenoid - if we use soft-iron as a core for the solenoid, then it produces the strongest magnetism.
