B) It is turned by water to produce a direct current....... hope it helps :)
Answer:
total time =4.583 hour
Explanation:
We have given total distance = 60 mi
It is given that half of the distance traveled by a speed of 8 mph
We know that 
And second half of the distance traveled by a speed of 36 mph
So time 
So total time = 3.75 + 0.833 =4.583 hour
Answer: 4.50*10^-6T (0.00000450071T)
Explanation: A current carrying conductor has been knowing to generate a specific amount of magnetic field.
This is given by the Bio-savart law (mathematical).
The Bio-savart law is a mathematical equation that gives the value of strength of the magnetic field created by a current carrying conductor.
B=(Uo* I) /2πr
Where
B= strength of magnetic field
Uo = magnetic permeability in free space = 1.257 *10^-6
r = distance between current carrying conductor and any reference point.
By doing the neccesary algebra, we have
B=(1.257 *10^-6 * 180)/ (2 * 3.142 * 8)
B= 2.2626 *10^-4 / 50.2857
B=4.5 * 10^-6T (0.00000450071T)
