Chapter 17 Conceptual Questions

If the result of your calculation of a quantity has SI units kg · m^2/(s^2· C), that quantity could be

• an electric potential energy

• an electric potential difference

• a capacitance

• an electric field strength

• a dielectric constant

If the result of your calculation of a quantity has SI units of kg · m/(s2· C), that quantity could be

• an electric field strength

• an electric potential energy

• a dielectric constant

• a capacitance

• an electric potential difference

As a proton moves in the direction the electric field lines

• it is moving from low potential to high potential and gaining electric potential energy

• it is moving from low potential to high potential and losing electric potential energy

• it is moving from high potential to low potential and gaining electric potential energy

• it is moving from high potential to low potential and losing electric potential energy

• both its electric potential and electric potential energy remain constant

As an electron moves in the direction the electric field lines

• it is moving from low potential to high potential and gaining electric potential energy

• it is moving from low potential to high potential and losing electric potential energy

• it is moving from high potential to low potential and gaining electric potential energy

• it is moving from high potential to low potential and losing electric potential energy

• both its electric potential and electric potential energy remain constant

As a proton moves in a direction perpendicular to the electric field lines

• it is moving from low potential to high potential and gaining electric potential energy

• it is moving from low potential to high potential and losing electric potential energy

• it is moving from high potential to low potential and gaining electric potential energy

• it is moving from high potential to low potential and losing electric potential energy

• both its electric potential and electric potential energy remain constant

A proton is accelerated from rest through a potential difference V0 and gains a speed v0. If it were accelerated instead through a potential difference of 2V0, what speed would it gain?

If the electric potential at a point in space is zero, then the electric field at that point must be

• uniform

• zero

• positive

• negative

• impossible to determine based on the information given

The electron-volt is a unit of

• electric potential

• electric force

• charge

• electric field

• energy

Four charged particles (two having a charge +Q and two having a charge -Q) are arranged in thexy-plane, as shown in the figure. These particles are all equidistant from the origin. The electric potential (relative to infinity) at point P on the z-axis due to these particles, is

• negative

• zero

• positive

• impossible to determine based on the information given

The electric potential at a distance of 4 m from a certain point charge is 200 V relative to infinity. What is the potential (relative to infinity) at a distance of 2 m from the same charge?

• 50 V

• 100 V

• 400 V

• 600 V

• 200 V