Two parallel plate capacitors,C1 and C2 are connected in series to a 60-V battery,a switch S,and a 200-K$\varOmega$resistor as shown in the figure.Both capacitors are air gap capacitors and have plates with an area of 2.0 cm2 and a separation of 0.10 mm.The capacitors are initially uncharged and switch S is open.After switch S is closed,how long will it take for the capacitors to charge to 50% of their maximum value?

A) 8.9 * 10-7 s B) 1.2 * 10-6 s C) 1.8 * 10-6 s D) 2.5 * 10-6 s E) 4.9 * 10-6 s A) 8.9 * 10-7 s B) 1.2 * 10-6 s C) 1.8 * 10-6 s D) 2.5 * 10-6 s E) 4.9 * 10-6 s

Exam 26: Direct Current Circuits

A 9.0000-V battery is used to produce a current through two identical resistors in series,each having a resistance of 150.00 kΏ.A handheld digital multimeter (DMM)is used to measure the potential difference across the first resistor by placing probe leads at each end of this resistor.Typical DMMs have an internal resistance of 10 M $\varOmega$ .What is the potential difference that the DMM measures across the first resistor?

(Multiple Choice)

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Question 21

The circuit in the figure has 5 resistors and 2 ideal batteries.What is the magnitude of the current in the 3-ohm resistor?

(Multiple Choice)

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Question 22

How long does it take to charge a 50-µF capacitor to 90% of its maximum value through a 100-Ω resistor?

(Multiple Choice)

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Question 23

A 0.20-mF capacitor discharges through a resistor with R = 61 k $\varOmega$ .How long will it take for the capacitor to reach 85% of its initial charge? $A 0.20-mF capacitor discharges through a resistor with R = 61 k \varOmega .How long will it take for the capacitor to reach 85% of its initial charge?$

(Multiple Choice)

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Question 24

A resistor and capacitor are connected in series in an open circuit.If a second identical resistor is connected in parallel in the circuit,the time constant for the circuit will

(Multiple Choice)

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Question 25

In the figure shown,the time constant for the discharge of the capacitor is

(Multiple Choice)

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Question 26

During a physics demonstration,a fully charged 98-µF capacitor is discharged through a 125- $\varOmega$ resistor.What fraction of the capacitor's fully charged energy remains after 6.2 ms?

(Multiple Choice)

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Question 27

In the circuit shown,with the switch open the capacitor is completely uncharged.The switch is closed for a long time.The current through the circuit is 0.2 A.Determine the value of the unknown resistor.

(Multiple Choice)

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Question 28

An ammeter must be placed in series with the circuit element whose current is to be measured.An ideal ammeter therefore has

(Multiple Choice)

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Question 29

Which one of the equations is incorrect for the circuit below?

(Multiple Choice)

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Question 30

You have an RC circuit with the switch initially open.When the switch is closed which of the voltage as a function of time plots most accurately represents the charging of the capacitor?

(Multiple Choice)

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Question 31

An RC circuit consisting of a 150 µF capacitor and a 1 M $\varOmega$ resistor is connected to a 100-V battery for a long time,and then the battery is shorted.After 30 s,a second identical resistor is placed in parallel with the original.What is the voltage across the capacitor 30 s after this?

(Multiple Choice)

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Question 32

The circuit in the figure has 5 resistors and 2 ideal batteries.What is the magnitude of the current in the 4-ohm resistor?

(Multiple Choice)

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Question 33

An RC circuit has a time constant of 2.10 s.At t = 0,the capacitor is fully charged.At what time will the energy stored in the capacitor be half of its initial value?

(Multiple Choice)

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Question 34

An old 9.0-V battery produces a potential difference of 9.0 V when checked with a voltmeter.A student is still suspicious of the battery and measures a voltage of 7.6 V when a 100-Ω resistor connects the battery leads.What is the internal resistance of this battery?

(Multiple Choice)

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Question 35

Consider a triangle with a 150-Ω resistor along each edge.The resistors are connected at the corners of the triangle.A power supply applies a potential difference of 3.6 V to two corners of the resistor triangle.How much current does the power supply source?

(Multiple Choice)

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Question 36

A capacitor stores energy of 1.25 J.If when it is connected by means of a switch to a 15- $\varOmega$ resistor it discharges to half this value in 15 s,how much charge flowed off the capacitor in this time?

(Multiple Choice)

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Question 37

The ammeter your physics instructor uses for in-class demonstrations has a resistance R_g and requires a current of 1.0 mA for full-scale deflection.The same ammeter can be used to measure currents of much greater values by wiring a shunt resistor of relatively small resistance,R_p ,in parallel with the ammeter.The shunt resistance needed to produce a full-scale current of 12 A is 3.5 m $\varOmega$ .What is the resistance of the ammeter,R_g?

(Multiple Choice)

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Question 38

Two parallel plate capacitors,C₁ and C₂ are connected in series to a 60-V battery,a switch S,and a 200-K $\varOmega$ resistor as shown in the figure.Both capacitors are air gap capacitors and have plates with an area of 2.0 cm² and a separation of 0.10 mm.The capacitors are initially uncharged and switch S is open.After switch S is closed,how long will it take for the capacitors to charge to 50% of their maximum value? $Two parallel plate capacitors,C1 and C2 are connected in series to a 60-V battery,a switch S,and a 200-K \varOmega resistor as shown in the figure.Both capacitors are air gap capacitors and have plates with an area of 2.0 cm2 and a separation of 0.10 mm.The capacitors are initially uncharged and switch S is open.After switch S is closed,how long will it take for the capacitors to charge to 50% of their maximum value?$

(Multiple Choice)

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Question 39

Two identical light bulbs are connected to a battery.Will the light bulbs be brighter if they are connected to the battery in series or in parallel?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 63

Exam 26: Direct Current Circuits

The circuit in the figure has 5 resistors and 2 ideal batteries.What is the magnitude of the current in the 3-ohm resistor?

How long does it take to charge a 50-µF capacitor to 90% of its maximum value through a 100-Ω resistor?

A 0.20-mF capacitor discharges through a resistor with R = 61 k Ω\varOmegaΩ .How long will it take for the capacitor to reach 85% of its initial charge?

A resistor and capacitor are connected in series in an open circuit.If a second identical resistor is connected in parallel in the circuit,the time constant for the circuit will

In the figure shown,the time constant for the discharge of the capacitor is

During a physics demonstration,a fully charged 98-µF capacitor is discharged through a 125- Ω\varOmegaΩ resistor.What fraction of the capacitor's fully charged energy remains after 6.2 ms?

In the circuit shown,with the switch open the capacitor is completely uncharged.The switch is closed for a long time.The current through the circuit is 0.2 A.Determine the value of the unknown resistor.

An ammeter must be placed in series with the circuit element whose current is to be measured.An ideal ammeter therefore has

Which one of the equations is incorrect for the circuit below?

You have an RC circuit with the switch initially open.When the switch is closed which of the voltage as a function of time plots most accurately represents the charging of the capacitor?

An RC circuit consisting of a 150 µF capacitor and a 1 M Ω\varOmegaΩ resistor is connected to a 100-V battery for a long time,and then the battery is shorted.After 30 s,a second identical resistor is placed in parallel with the original.What is the voltage across the capacitor 30 s after this?

The circuit in the figure has 5 resistors and 2 ideal batteries.What is the magnitude of the current in the 4-ohm resistor?

An RC circuit has a time constant of 2.10 s.At t = 0,the capacitor is fully charged.At what time will the energy stored in the capacitor be half of its initial value?

An old 9.0-V battery produces a potential difference of 9.0 V when checked with a voltmeter.A student is still suspicious of the battery and measures a voltage of 7.6 V when a 100-Ω resistor connects the battery leads.What is the internal resistance of this battery?

Consider a triangle with a 150-Ω resistor along each edge.The resistors are connected at the corners of the triangle.A power supply applies a potential difference of 3.6 V to two corners of the resistor triangle.How much current does the power supply source?

A capacitor stores energy of 1.25 J.If when it is connected by means of a switch to a 15- Ω\varOmegaΩ resistor it discharges to half this value in 15 s,how much charge flowed off the capacitor in this time?

Two identical light bulbs are connected to a battery.Will the light bulbs be brighter if they are connected to the battery in series or in parallel?

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During a physics demonstration,a fully charged 98-µF capacitor is discharged through a 125- $\varOmega$ resistor.What fraction of the capacitor's fully charged energy remains after 6.2 ms?

An RC circuit consisting of a 150 µF capacitor and a 1 M $\varOmega$ resistor is connected to a 100-V battery for a long time,and then the battery is shorted.After 30 s,a second identical resistor is placed in parallel with the original.What is the voltage across the capacitor 30 s after this?

A capacitor stores energy of 1.25 J.If when it is connected by means of a switch to a 15- $\varOmega$ resistor it discharges to half this value in 15 s,how much charge flowed off the capacitor in this time?