Question

the electro-magnetic connectionhow do electromagnets work?what do a wrecking yard and a rock concert have in common? they each use electromagnets, a device that create a magnetic field through the application of electricity. wrecking yard use extremely powerful electromagnets to move heavy pieces of scrap metal or even entire cars from one place to another. your favorite band uses electromagnets to amplify the sound coming out of its speakersmechanically, an electromagnet is pretty simple. an electromagnet is made up of a length of conductive wire, usually copper, wrapped around a piece of metal and a source of electricity. like frankensteins monster, this seems like little more than a loose collection of parts until electricity comes into the picturewhen a current is introduced, either from a battery or another source of electricity, the current flows through the wire. this creates a magnetic field around a coiled wire, magnetizing the metal as if it were a permanent magnet. electromagnets are useful because you can turn the magnet on and off by completing or interrupting the circuit. a closed circuit creates the flow of electricity that allows the magnet to be turned on. an open circuit causes the flow of electricity to stop, and this turns the electromagnet off.1. what 3 things would you need to build an electromagnet?2. what happens when the current in an electromagnet is introduced?3. how do you turn an electromagnet on and off? (highlight the correct answer)a on - open the circuit; off - close the circuitb on - close the circuit; off - open the circuitwho discovered that electricity and magnetism were related?19th century scientist michael faraday made several important discoveries in chemistry, but it was his work with electricity that had the greatest impact. faraday discovered that an electrical current running through a wire created a magnetic field around the wire. for this reason, a compass will point the direction that the current is flowing.faraday designed an experiment that wrapped two insulated wires around a large iron ring. when he sent an electrical current through one of the wires, he detected a current running in the other. the current couldnt have passed from one wire to the other because of the conduction - the insulation surrounding the wires made that possible. faraday suspected it had something to do with the magnetic field surrounding the first wire.

Explanation:

1. Identified the components of an electromagnet from the text description of its structure.
2. Found the effect of introducing current from the text's explanation of how electromagnets activate.
3. Matched the on/off mechanism to the correct circuit state description in the text.

Answer:

1. A length of conductive (usually copper) wire, a piece of metal, and a source of electricity.
2. When current is introduced, it flows through the wire, creating a magnetic field around the coiled wire and magnetizing the metal like a permanent magnet.
3. b. on – close the circuit, off – open the circuit