Where’s the image?? i don’t see it
The independent variable is b the amount of chores you do
Answer:
the field at the center of solenoid 2 is 12 times the field at the center of solenoid 1.
Explanation:
Recall that the field inside a solenoid of length L, N turns, and a circulating current I, is given by the formula:
Then, if we assign the subindex "1" to the quantities that define the magnetic field (
) inside solenoid 1, we have:

notice that there is no dependence on the diameter of the solenoid for this formula.
Now, if we write a similar formula for solenoid 2, given that it has :
1) half the length of solenoid 1 . Then 
2) twice as many turns as solenoid 1. Then 
3) three times the current of solenoid 1. Then 
we obtain:

force applied due to earth on the apple is given as

given that
m = 0.37 kg
a = 9.8 m/s^2
now we have


now as per Newton's III law equal and opposite force is applied on earth
so now we can find acceleration of Earth using same equation as we used above

here we know that
m = mass of earth
F = 3.63 N



so acceleration of earth is very small and given by above value