Answer:
Number of turns per unit length will be 
Explanation:
We have given that strength of the magnetic field produced by the solenoid B = 7 T
Current in the solenoid i = 200 A
Let the number of turns per unit length is n
Magnetic field due to solenoid is given as 
here 
is permeability of free space n is number of turns per unit length and i is current
So 
Here is the answer!!!!!!!
Kinetic Energy = (1/2) mv^2.
m = 57.7 g = 57.7/1000 = 0.00577 kg.
v = 325 m/s.
E = 0.5 * 0.00577 * 325^ 2. Use your calculator.
E = 304.728125 J.
That's the kinetic energy.
<h2>T
he average speed for the entire trip is 47.5 m/s .</h2>
It is given that for different time span car have different speed and also the person spend 
in eating lunch and buying gas.
We know , average speed is total distance covered by total time taken .
Therefore , average speed , 
Hence, this is the required solution.
Learn More :
Average speed
https://brainly.in/question/12701198
