A droplet of ink in an industrial ink-jet printer carries a charge of 1.1×10−10 C and is deflected onto paper by a force of 3.7×10−4 N.Find the strength of the electric field to produce this force.

Answer 1

Force = q*E

Solve for the electric field
E = F/q
= 3.7*10^-4/1.1*10^-10
= 3.4*10^6 ,
in units of N/C. (Those units are the same as Volts/meter)