Iron, copper wire and dry cell batteries
nothing
Spectrum
Not really. You could have both an electric field and a magnetic field occupying the same space at the same time but they wouldn't 'make the definition' of electromagnetic until they began to fluxuate in phase at a harmonized frequency.
Yes, both electric and magnetic fields make up electromagnetic waves. We know that electromagnetic waves (like light) have both an electric and a magnetic component. Both of these components are waves, and they move (propagate) at right angles to each other, and in phase.
The existence of electromagnetic waves was first confirmed by Hertz
Three things you need to make an electromagnetic are a magnetic field, an electric current, and a conductor or coil of wire. When an electric current flows through the conductor, a magnetic field is created around it, resulting in an electromagnetic effect.
Heat and oxygen and fuel
The three things that are needed for photosynthesis is water,carbon dioxide,and sunlight
A Surplus of FoodDivision of LaborPresence of Cities
The three things needed to make a fire burn, what is called the Fire Triangle, are 1] oxygen 2] heat 3] fuel
There are only 2A coil of condutor wireA flow of electricity in that coil of wire.
The three things that plants need for photonynthesis to occur is sunlight,carbon dioxide and water.
Three things are needed to make fire:fueloxygenheatThe heat source can be a flame, but it doesn't have to be. Many modern ovens, stoves and barbecue grills ignite the fuel with an electrical spark.
lightwatercarbon dioxidechlorophyll
Energy
adenosine triphosphate
Fuel, oxygen and heat or an ignition source are the components needed for a fire.