A) We need to calculate the Magnetic flux of a Solenoid,

Where B is the magnetic field and A the Area.

Here \mu_0 is the permeability constant, I the current and N number of turns.
Replacing we have,



B) We calculate the mutual inductance, so



c) We calculate the emf



Answer:
51.96 years
2) 30 million of years
Explanation:
First we must know the travel time of the ship seen from the earth. The spaceship travels at half the speed of light, this means that the amount of time the spacecraft must spend to travel the same distance is double compared to the light, that is 60 years.
Now due to the speed of the ship, we must take into account relativistic effects, such as time dilation, this is given by:

Where t is the time measured in the ship, t' is the time measured in the earth, inertially moving with velocity v.
Rewriting for t:

This is the amount of time it would take you reach the Whirlpool galaxy in the spaceship.
2) a light year is a measure of distance, which indicates the kilometers that light travels in a year. Thus, the light emitted by Whirlpool galaxy takes 30 million of years reaches our planet.
Geocentric means earth centered
So answer is C - the earth in no longer believed to be the center of the solar system
Im think its A. A release of a large amount 9f energy