Q: A point charge produces a potential of $$-2.00\,V at a $$distance of $$1.00\,mm. $$What is the sign and magnitude of the charge?

Negative, $$2.22 \times 10$$^{-13}$$\,C$$

Q: A $$1.50\,m^2$ parallel plate capacitor is separated by 0.0200$$\,mm$$ of neoprene rubber (k=6.7$). What is its capacitance?

$$C = 4.45 \times 10$$^{-6}$$\,F$$

Q: A $$2.00\,\mu F$$ and a $$7.40\,\mu F$$ capacitor are connected in series to a $$9.00\,V$$ battery. What is the total charge stored in the series connection?

$$Q = 1.41 \times 10$$^{-5}$$\,C$$

Question 1

A proton is released from rest at point A in a uniform electric field between two parallel plates, as shown in the third image. If the distance between the plates is $$d$$ and the potential difference is $$V_{AB}$$, what is the kinetic energy of the proton when it reaches point B?

Accepted Answer

$$KE = qV_{AB}$$

Question 2

Which of the following statements about equipotential lines and electric field lines is correct?

Accepted Answer

Equipotential lines are always perpendicular to electric field lines.

Question 3

A parallel plate capacitor is connected to a battery as shown in the eighth image. If the area of each plate is $$A$$ and the separation is $$d$$, what is the capacitance of the capacitor?

Accepted Answer

$$C = \$$varepsilon_0$$ \frac{A}{d}$$

Question 4

If a dielectric material with dielectric constant $$k is $$inserted between the plates of a parallel plate capacitor, how does the capacitance change?

Accepted Answer

$$C_{new} = kC_{original}$$

Question 5

A $$10\,\mu F$$ and a $$2.5\,\mu F$$ capacitor are connected in parallel, and this combination is connected in series with a $$0.30\,\mu F$$ capacitor (see the 15th image). What is the total capacitance of the combination?

Accepted Answer

$$C_{total} = 0.29\,\mu F$$

Question 6

Which material from the dielectric table (ninth image) would allow the highest capacitance for a given parallel plate capacitor, assuming the same plate area and separation?

Accepted Answer

Strontium titanate

Question 7

A $$8.00\,nF$$ capacitor stores $$0.160\,mC of $$charge. What voltage must be applied to the capacitor?

Accepted Answer

$$V = 20,000\,V$$

Question 8

Which of the following is true for capacitors connected in series?

Accepted Answer

They all have the same charge.

Question 9

A point charge produces a potential of $$-2.00\,V at a $$distance of $$1.00\,mm. $$What is the sign and magnitude of the charge?

Accepted Answer

Negative, $$2.22 	imes 10$$^{-13}$$\,C$$

Question 10

What is the energy stored in a $$10.0\,\mu F$$ capacitor charged to $$9.00 	imes 10^3$\,V$$?

Accepted Answer

$$E_{cap} = 405\,J$$

Question 11

Which of the following best describes the relationship between electric potential energy and kinetic energy for a charge moving in an electric field, as shown in the first image?

Accepted Answer

$$\Delta PE_{elec} = -\Delta KE$$

Question 12

If the electric field between two parallel plates is $$1.50 	imes 10^6$\,V/m$$ and the plates are separated by $$1.00\,cm$$, what is the potential difference between the plates?

Accepted Answer

$$V = 1.50 	imes 10^4$\,V$$

Question 13

Which of the following is true for capacitors connected in parallel?

Accepted Answer

They all have the same voltage.

Question 14

A $$1.50\,m^2$ parallel plate capacitor is separated by 0.0200$$\,mm$$ of neoprene rubber (k=6.7$). What is its capacitance?

Accepted Answer

$$C = 4.45 	imes 10$$^{-6}$$\,F$$

Question 15

Which of the following is the correct formula for the electric potential due to a point charge $$Q at a $$distance $$r$$?

Accepted Answer

$$V = \frac{kQ}{r}$$

Question 16

A $$2.00\,\mu F$$ and a $$7.40\,\mu F$$ capacitor are connected in series to a $$9.00\,V$$ battery. What is the total charge stored in the series connection?

Accepted Answer

$$Q = 1.41 	imes 10$$^{-5}$$\,C$$

Question 17

Which of the following is NOT a correct symbol for a capacitor as shown in the tenth image?

Accepted Answer

A zigzag line

Question 18

If a conductor is grounded, what is its electric potential?

Accepted Answer

Zero volts

Question 19

Which of the following best describes the energy stored in a capacitor?

Accepted Answer

$$E_{cap} = \frac{1}{2}CV^2$

Electric Potential, Capacitors, and Energy Storage: Study Notes for College Physics II

Study Guide - Practice Questions

Study Guide - Flashcards