On which principle does a thermometer is based

In 1980, alfa romeo introduced the first system to smooth a rough idle caused by ignition and camshaft timing changes.

If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction

Which statement best explains why the overall charge on an atom is zero?