Answer:
23
Explanation:
The line starts at 31, it then drops down to about 23. It then drops even more to about 14. It then raises to 20 and then raises to 23.
Hope this helps!
Magnetic field is proportional to NIA.
N is the number of turns, I is the current and A is the area
You see N=2n, I = 3 i. Therefore, it will 6 times stronger
200*6= 1200 kg. It can lift now is 1200 kg.
As we know that circumference of the sphere is given as

here we know that

now we have



PART B)
surface area of the sphere is given as




PART C)
Volume of the sphere is given as

here we have

