A coil with an area of 0.10 m2 is in a magnetic field of 0.20 T perpendicular to its
area. It is flipped through 180° so that the part that was up is down. The flip takes
1.0 s. Estimate the average induced emf between the ends of the coil while it is
being flipped.
A.)0.0 V
B.)0.020
C.)0.040
D.)0.010

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.