To solve this problem it is necessary to apply the concepts related to mutual inductance in a solenoid.
This definition is described in the following equation as,

Where,
 permeability of free space
permeability of free space
 Number of turns in solenoid 1
 Number of turns in solenoid 1
 Number of turns in solenoid 2
 Number of turns in solenoid 2
 Cross sectional area of solenoid
 Cross sectional area of solenoid 
l = Length of the solenoid 
Part A ) 
Our values are given as,





Substituting,



PART B) Considering that many of the variables remain unchanged in the second solenoid, such as the increase in the radius or magnetic field, we can conclude that mutual inducantia will appear the same.
 
        
             
        
        
        
They will hit the ground at the same time, as mass is negligible when calculating the acceleration of gravity when there is no air resistance
        
             
        
        
        
The gravitational constant was experimentally measured by W Cavendish using the attraction between big and small lead balls. is true
The correct answer is true
<h3>How do you define gravitational constant?</h3>
the strength of gravity. a factor in use in Newton's gravity law to relate the strength of the gravitational pull between two bodies with their masses and distance from one another. 6.67259 X 10-11 newtons per square kilogram is roughly the gravitational constant. G is its identifier.
<h3> where is the strongest gravity is?</h3>
The gravitational pull of the earth is greatest near sea level, normally, and weakens as you get further from the center, such as to the summit of Mt. Everest. Because the obloid earth was slightly wider, but only by a minor ratio, the gravity just at poles is stronger than that at the equator.
To know more about gravitational constant visit:
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