Acoil of 1000 turns encloses an area of 25cm2. it is rotated in 0.010 s from a position where its plane is perpendicular to earth’s magnetic field to one where its plane is parallel to the field. if the strength of the field is 6.0×10−5t, what is the average emf induced in the coil?

Emf will be 0.015 volt

Explanation:

We have given number of turns N = 1000

Area

Time t = 0.010 sec

Magnetic field

Since plane is perpendicular to the magnetic field so

We know that emf is given by

3.2x10^7

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.