Question 1

A parallel plate capacitor is made of two circular thin plates of radius 15 cm separated by 2.5 mm of a material with dielectric constant 32.If they are charged to a potential difference of 22 V,what is the charge resident on each plate?

Accepted Answer

A) 58 nC 
B) 180 nC 
C) 220 nC 
D) 700 nC 
E) 1.2 $\mu$C

Question 2

If the Earth,radius 6371 km,was treated as a metallic sphere,and was charged to a potential of 110 V,what excess electric charge would reside on its surface?

Accepted Answer

A) 5.0 * 103 C 
B) 0.078 C 
C) 0.98 C 
D) 7.8 * 10-5 C 
E) 9.8 * 10-4 C

Question 3

If I double the area of a capacitor and double the distance between its plates,the capacitance will be

Accepted Answer

A) doubled. 
B) quadrupled. 
C) unchanged. 
D) halved. 
E) one quarter.

Question 4

Find the net force between two positively charged objects,each with charge of 1.2 mC,separated by a distance of 2.0m.They are in a material where the electric permittivity is 1.25 * 10-11 C2/(N·m2).

Accepted Answer

A) 2300 N 
B) 3200 N 
C) 6400 N 
D) 4600 N 
E) 2.6 * 1014 N

Question 5

A 9-V battery is connected across a capacitor of 20 µF through a switch which is initially open.The amount of charge that flows from the battery to the capacitor when the switch is closed is

Accepted Answer

A) 2.22 µC. 
B) 45 µC. 
C) 90 µC. 
D) 180 µC. 
E) 210 µC.

Question 6

Two parallel plate capacitors,C1 and C2 are connected in series to a 9.0-V battery.If capacitor C1 has a capacitance of 10 nF and capacitor C2 has a capacitance of 40 nF,what is the magnitude of the charge on each plate of capacitor C2?

Accepted Answer

A) 72 nC 
B) 90 nC 
C) 290 nC 
D) 360 nC 
E) 450 nC

Question 7

The Earth has an electric field of 150 N/C near its surface.Find the electrical energy contained in a volume of air equal to the volume of a typical student (0.075 m3).

Accepted Answer

A) 5.0 * 10-11 J 
B) 7.5 * 10-9 J 
C) 1.5 * 10-8 J 
D) 1.0 * 10-7 J 
E) 1700 J

Question 8

Two capacitors C1 = 2.5 mF and C2 = 5.0 mF are connected in series.If a voltage of V = 120 volts is applied across the capacitors,what is the energy stored in capacitor C2?

Accepted Answer

A) 4.0 J 
B) 36 J 
C) 54 J 
D) 12 J 
E) 0

Question 9

A parallel plate capacitor is made of two circular thin plates of radius 15 cm separated by 2.5 mm of some unknown material.If they are charged to a potential difference of 22 V,what and the charge resident on each plate is 2.0 * 10-7 C,what is the dielectric constant of the material in the space between the plates?

Accepted Answer

A) 36 
B) 9.1 
C) 12 
D) 0.54

Question 10

A parallel plate capacitor has square plates of side L = 12 cm,and a distance d = 2 cm between the plates.Half of the capacitor area is filled with a dielectric of with k1= 35.The other half is filled with a different dielectric with k2 = 8.The effective (equivalent)capacitance of the capacitor is

Accepted Answer

A) 6.4 * 10-12 
B) 3.2 * 10-12 
C) 2.7 * 10-10 
D) 1.4 * 10-10 
E) 1.1 * 10-10

Question 11

Suppose we have two capacitors connected in series with a 10 V battery.What is the energy stored in the circuit if the capacitance of one is C1 = 50 mF and the other is C2 = 100 mF?

Accepted Answer

A) 9.67 J 
B) 2.33 J 
C) 1.67 J 
D) 3.33 J 
E) 7.50 J

Question 12

If the Earth,radius 6371 km,was treated as a metallic sphere,and was given 15 kC of excess electric charge,what would the potential be on its surface?

Accepted Answer

A) 21 MV 
B) 1.7 MV 
C) 11 V 
D) 130 V 
E) 3.3 V

Question 13

A 2.0-nF parallel plate capacitor with a sheet of mylar (k = 3.1)filling the space between the plates is charged to a potential difference of 90 V and is then disconnected.How much work would be required to completely remove the sheet of mylar from the space between the two plates?

Accepted Answer

A) 1.7 * 10-5 J 
B) 3.5 * 10-5 J 
C) 5.6 * 10-5 J 
D) 8.1 * 10-5 J

Question 14

A 10-nF is connected in series with a 20-nF capacitor.This combination is then placed in parallel with a 30-nF capacitor.This combination is then placed parallel to a 9.0-V battery.What is charge drawn from the battery?

Accepted Answer

A) 60 nC 
B) 90 nC 
C) 140 nC 
D) 180 nC 
E) 330 nC

Question 15

What is the energy ($\mu$J)stored in the capacitors in this circuit?

Accepted Answer

A) 72 
B) 36 
C) 162 
D) 60 
E) 0.333

Question 16

A battery is connected across a capacitor of 20 µF through a switch which is initially open.The 240 µC.of charge flows from the battery to the capacitor when the switch is closed.The electric potential provided by the battery is

Accepted Answer

A) 9.0 V 
B) 12 V 
C) 6.0 V 
D) 24 V 
E) 48 V

Question 17

Consider a parallel plate capacitor with area 1485 cm2.The plates are separated by a distance 0.100 mm.The volume between the plates is filled with a material with a dielectric constant of 3.10.A voltage of 70.0 V is maintained across the plates using a battery.What is the charge stored in the capacitor (in $\mu$C)?

Accepted Answer

A) 2.14 
B) 2.85 
C) 3.79 
D) 5.04 
E) 6.71

Question 18

A parallel plate capacitor without dielectric and with capacitance C = 3.0 $\mu$F is connected to a battery with potential difference  V.A charge is stored on the capacitor.Now,a dielectric material (  )is inserted between the plates of this capacitor.After the dielectric has been inserted,what is the charge on the capacitor?

Accepted Answer

A) 1.0 * 10-5 C 
B) 2.7 * 10-5 C 
C) 4.4 * 10-5 C 
D) 6.3 * 10-5 C 
E) 8.4 *10-5 C

Question 19

Two capacitors C1 = 2.5 mF and C2 = 5.0 mF are connected in parallel.If a voltage of V = 120 volts is applied across the capacitors,what is the energy stored in capacitor C2?

Accepted Answer

A) 1.35 J 
B) 36 J 
C) 54 J 
D) 1.35 * 106 J 
E) 0

Question 20

A 2.0-nF parallel plate capacitor with a sheet of mylar (k = 3.1)filling the space between the plates is connected to a 90 V battery.While it is still connected to the battery,the sheet of mylar is completely removed from the space between the two plates.Determine the change in the charge on one of the plates.

Accepted Answer

A) -1.0 * 10-7 C 
B) -1.2 * 10-7 C 
C) -1.4 * 10-7 C 
D) -1.6 * 10-7 C

Exam 24: Capacitors

A parallel plate capacitor is made of two circular thin plates of radius 15 cm separated by 2.5 mm of a material with dielectric constant 32.If they are charged to a potential difference of 22 V,what is the charge resident on each plate?

If the Earth,radius 6371 km,was treated as a metallic sphere,and was charged to a potential of 110 V,what excess electric charge would reside on its surface?

If I double the area of a capacitor and double the distance between its plates,the capacitance will be

Find the net force between two positively charged objects,each with charge of 1.2 mC,separated by a distance of 2.0m.They are in a material where the electric permittivity is 1.25 * 10^-11 C²/(N·m²) .

A 9-V battery is connected across a capacitor of 20 µF through a switch which is initially open.The amount of charge that flows from the battery to the capacitor when the switch is closed is

Two parallel plate capacitors,C₁ and C₂ are connected in series to a 9.0-V battery.If capacitor C₁ has a capacitance of 10 nF and capacitor C₂ has a capacitance of 40 nF,what is the magnitude of the charge on each plate of capacitor C₂?

The Earth has an electric field of 150 N/C near its surface.Find the electrical energy contained in a volume of air equal to the volume of a typical student (0.075 m³) .

Two capacitors C₁ = 2.5 mF and C₂ = 5.0 mF are connected in series.If a voltage of V = 120 volts is applied across the capacitors,what is the energy stored in capacitor C₂?

Suppose we have two capacitors connected in series with a 10 V battery.What is the energy stored in the circuit if the capacitance of one is C₁ = 50 mF and the other is C₂ = 100 mF?

If the Earth,radius 6371 km,was treated as a metallic sphere,and was given 15 kC of excess electric charge,what would the potential be on its surface?

A 2.0-nF parallel plate capacitor with a sheet of mylar (k = 3.1) filling the space between the plates is charged to a potential difference of 90 V and is then disconnected.How much work would be required to completely remove the sheet of mylar from the space between the two plates?

A 10-nF is connected in series with a 20-nF capacitor.This combination is then placed in parallel with a 30-nF capacitor.This combination is then placed parallel to a 9.0-V battery.What is charge drawn from the battery?

What is the energy ( $\mu$ J) stored in the capacitors in this circuit? $What is the energy ( \mu J) stored in the capacitors in this circuit? A) 72 B) 36 C) 162 D) 60 E) 0.333$

A battery is connected across a capacitor of 20 µF through a switch which is initially open.The 240 µC.of charge flows from the battery to the capacitor when the switch is closed.The electric potential provided by the battery is

Two capacitors C₁ = 2.5 mF and C₂ = 5.0 mF are connected in parallel.If a voltage of V = 120 volts is applied across the capacitors,what is the energy stored in capacitor C₂?

Exam 24: Capacitors

A parallel plate capacitor is made of two circular thin plates of radius 15 cm separated by 2.5 mm of a material with dielectric constant 32.If they are charged to a potential difference of 22 V,what is the charge resident on each plate?

If the Earth,radius 6371 km,was treated as a metallic sphere,and was charged to a potential of 110 V,what excess electric charge would reside on its surface?

If I double the area of a capacitor and double the distance between its plates,the capacitance will be

Find the net force between two positively charged objects,each with charge of 1.2 mC,separated by a distance of 2.0m.They are in a material where the electric permittivity is 1.25 * 10-11 C2/(N·m2) .

A 9-V battery is connected across a capacitor of 20 µF through a switch which is initially open.The amount of charge that flows from the battery to the capacitor when the switch is closed is

Two parallel plate capacitors,C1 and C2 are connected in series to a 9.0-V battery.If capacitor C1 has a capacitance of 10 nF and capacitor C2 has a capacitance of 40 nF,what is the magnitude of the charge on each plate of capacitor C2?

The Earth has an electric field of 150 N/C near its surface.Find the electrical energy contained in a volume of air equal to the volume of a typical student (0.075 m3) .

Two capacitors C1 = 2.5 mF and C2 = 5.0 mF are connected in series.If a voltage of V = 120 volts is applied across the capacitors,what is the energy stored in capacitor C2?

A parallel plate capacitor has square plates of side L = 12 cm,and a distance d = 2 cm between the plates.Half of the capacitor area is filled with a dielectric of with k1= 35.The other half is filled with a different dielectric with k2 = 8.The effective (equivalent) capacitance of the capacitor is

Suppose we have two capacitors connected in series with a 10 V battery.What is the energy stored in the circuit if the capacitance of one is C1 = 50 mF and the other is C2 = 100 mF?

If the Earth,radius 6371 km,was treated as a metallic sphere,and was given 15 kC of excess electric charge,what would the potential be on its surface?

A 2.0-nF parallel plate capacitor with a sheet of mylar (k = 3.1) filling the space between the plates is charged to a potential difference of 90 V and is then disconnected.How much work would be required to completely remove the sheet of mylar from the space between the two plates?

A 10-nF is connected in series with a 20-nF capacitor.This combination is then placed in parallel with a 30-nF capacitor.This combination is then placed parallel to a 9.0-V battery.What is charge drawn from the battery?

What is the energy ( μ\muμ J) stored in the capacitors in this circuit?

A battery is connected across a capacitor of 20 µF through a switch which is initially open.The 240 µC.of charge flows from the battery to the capacitor when the switch is closed.The electric potential provided by the battery is

Two capacitors C1 = 2.5 mF and C2 = 5.0 mF are connected in parallel.If a voltage of V = 120 volts is applied across the capacitors,what is the energy stored in capacitor C2?

Find the net force between two positively charged objects,each with charge of 1.2 mC,separated by a distance of 2.0m.They are in a material where the electric permittivity is 1.25 * 10^-11 C²/(N·m²) .

Two parallel plate capacitors,C₁ and C₂ are connected in series to a 9.0-V battery.If capacitor C₁ has a capacitance of 10 nF and capacitor C₂ has a capacitance of 40 nF,what is the magnitude of the charge on each plate of capacitor C₂?

The Earth has an electric field of 150 N/C near its surface.Find the electrical energy contained in a volume of air equal to the volume of a typical student (0.075 m³) .

Two capacitors C₁ = 2.5 mF and C₂ = 5.0 mF are connected in series.If a voltage of V = 120 volts is applied across the capacitors,what is the energy stored in capacitor C₂?

Suppose we have two capacitors connected in series with a 10 V battery.What is the energy stored in the circuit if the capacitance of one is C₁ = 50 mF and the other is C₂ = 100 mF?

What is the energy ( $\mu$ J) stored in the capacitors in this circuit? $What is the energy ( \mu J) stored in the capacitors in this circuit? A) 72 B) 36 C) 162 D) 60 E) 0.333$

Two capacitors C₁ = 2.5 mF and C₂ = 5.0 mF are connected in parallel.If a voltage of V = 120 volts is applied across the capacitors,what is the energy stored in capacitor C₂?