You are learning about energy transformations in science class. sally's group made this electromagnet using a battery and some wire. describe the energy transformation you see here.

electrical to magnetic energy

Explanation:

In an electromagnet, the electric current produces magnetic field. A conducting wire is wrapped into coil. when current is passed through the coil, magnetic field is concentrated at the center of the coil.

Here, a battery is used to produce current in the wire. Thus, electrical energy gets converted to magnetic energy.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.