Answer:
a)
b)
Explanation:
From the question we are told that:
Distance between wires 
Wire 1 current 
Wire 2 current
a)
Generally the equation for Force on
due to
is mathematically given by

Where
B_2=Magnetic field current by 

Therefore




b)
Generally the equation for Force on
due to
is mathematically given by

Where
B_1=Magnetic field current by 

Therefore


<span>The time needed for a wave to make one complete cycle is its period.</span>
When you are going down you pick up more speed
Answer is C. All of the others are internal/molecular changes.