Hey there!
The answer to your question is: Iron
There is a very high concentration of iron and other metals in the mesosphere. There is a further buildup of these metals when meteorites burn up in the atmosphere and release such metal atoms.
Thank you!
I = Current q = total charge t =time taken to pass electron from a certain point. Number of Electrons =2.5×1019. Total charge q=ne=2.5×1019×1.6×10−19=2.5×1.6= 4C.
That way the 5 cm long vector represents 50 km/h
Answer:
35.36776 Hz
Explanation:
B = Magnetic field = 
= Maximum voltage = 20 V
d = Diameter of coil = 40 cm = 0.4 m
A = Area = 
N = Number of turns = 500
= Angular velocity
Maximum emf is given by

The angular velocity would be 35.36776 Hz
I Think The answer would be c I hope it helps My friend Message Me if I’m wrong and I’ll change My answer and fix it for you