Answer:

Explanation:
Given that,
The current in the loop, I = 2 A
The radius of the loop, r = 0.4 m
We need to find the magnetic field at a distance 0.09 m along the axis and above the center of the loop. The formula for the magnetic field at some distance is given as follows :

Put all the values,

So, the required magnetic field is equal to
.
I believe it is Acoustics, the real name for it would be like Reverberation. But go with Acoustics. :)
Light because they need light to grow
Ep= mgh
Ep = 40 x 9.8 x 10
Ep = 3920J
Ep = 3900J (2sf)
Answer:
8 mph
Explanation:
4 miles in half hour so you add 4 more for the second half