Kayla has two magnets. She would like to know how much magnetic energy is stored in
each one. What would be the best way for her to determine which magnet has
the most magnetic energy?
O Record the mass of each magnet by measuring it on a balance scale.
O Put each magnet into a beaker of water to see how much water it displaces
O Measure how close each magnet can get to a metal object before picking it up.
O Attach wires to the ends of each magnet and measure the currents going through the wires

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.

explanation:

wheres the pic