What magnitude charge creates a 1.0 n/cn/c electric field at a point 1.0 mm away?

What is the fate of the electrons that interact with a specimen in an electron microscope?

It is really hard for me right know

Apotter's wheel moves uniformly from rest to an angular speed of 0.20 rev/s in 32.0 s. (a) find its angular acceleration in radians per second per second. rad/s2 (b) would doubling the angular acceleration during the given period have doubled final angular speed?