How to find number of turns in the secondary coil when given the number of turns in the primary coil

Explanation:

Apply a known AC voltage to the primary coil. Call it V₁

Measure the resultant voltage on the secondary coil. Call it V₂

If N₁ is the number of turns on the primary coil

and N₂ is the number of turns on the secondary coil

N₂ / N₁ = V₂ / V₁

N₂ = N₁V₂ / V₁

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.