Answer:
I'm 3 percent it is b soooooo
The best answer between the two options would be the second choice B) FALSE.
No, we cannot touch gravity nor can we physically see it. We can only see how it works.
Answer :
Velocity will be 
Explanation:
We have given glass surface has a diameter of 1.5 mm
And charge q = 1.60 nC
Radius of electrons orbit r = height of electron above surface + radius of sphere = 
Force on electron is given by
, here q is charge on sphere and e is charge on electron

This force work as centripetal force
So 

v = 
E, 63% of the value. I forget the rationale behind it but I learnt that in engineering. 90% confident for that answer.