Question 1

In a loop in a closed circuit, the sum of the currents entering a junction equals the sum of the currents leaving a junction because:

Accepted Answer

A) the potential of the nearest battery is the potential at the junction. 
B) there are no transformations of energy from one type to another in a circuit loop. 
C) capacitors tend to maintain current through them at a constant value. 
D) current is used up after it leaves a junction. 
E) charge is neither created nor destroyed at a junction. 
A) the potential of the nearest battery is the potential at the junction. 
B) there are no transformations of energy from one type to another in a circuit loop. 
C) capacitors tend to maintain current through them at a constant value. 
D) current is used up after it leaves a junction. 
E) charge is neither created nor destroyed at a junction.

Question 2

Which two circuits are exactly equivalent?

Accepted Answer

A) A and B 
B) B and C 
C) C and D 
D) D and E 
E) B and E 
A) A and B 
B) B and C 
C) C and D 
D) D and E 
E) B and E

Question 3

An initially uncharged 10-$\mu$F capacitor is charged by a 10-V battery through a resistance R.The capacitor reaches a potential difference of 4 V in a period of 3 s after the charging began.Find the value of R.

Accepted Answer

The answer of An initially uncharged 10-$\mu$F capacitor is charged...

Question 4

The circuit below contains 3100-W light bulbs and a capacitor.The emf is 110 V.Which light bulb(s) is(are) brightest? (Assume the capacitor is fully charged.)

Accepted Answer

A) A 
B) B 
C) C 
D) A and B 
E) All three are equally bright. 
A) A 
B) B 
C) C 
D) A and B 
E) All three are equally bright.

Question 5

The capacitors are completely discharged in the circuit shown below.   The two resistors have the same resistance R and the two capacitors have the same capacitance C.After the switch is closed, the current:

Accepted Answer

A) is greatest in C1. 
B) is greatest in C2. 
C) is greatest in R1. 
D) is greatest in R2. 
E) is the same in C1, C2, R1 and R2. 
A) is greatest in C1. 
B) is greatest in C2. 
C) is greatest in R1. 
D) is greatest in R2. 
E) is the same in C1, C2, R1 and R2.

Question 6

Determine the magnitude and sense (direction) of the current in the 500-$\Omega$ resistor when I = 30 mA.

Accepted Answer

A) 56 mA left to right 
B) 56 mA right to left 
C) 48 mA left to right 
D) 48 mA right to left 
E) 26 mA left to right 
A) 56 mA left to right 
B) 56 mA right to left 
C) 48 mA left to right 
D) 48 mA right to left 
E) 26 mA left to right

Question 7

What is the equivalent resistance between points A and B in the figure when R = 18 $\Omega$?

Accepted Answer

A) 48$\Omega$ 
B) 64 $\Omega$ 
C) 80 $\Omega$ 
D) 96 $\Omega$ 
E) 110$\Omega$ 
A) 48$\Omega$ 
B) 64 $\Omega$ 
C) 80 $\Omega$ 
D) 96 $\Omega$ 
E) 110$\Omega$

Question 8

Determine the potential difference Va - Vb shown in the circuit below.

Accepted Answer

A) (-5.0 V) 
B) +5.0 V 
C) (-10 V) 
D) +10 V 
E) 0 V 
A) (-5.0 V) 
B) +5.0 V 
C) (-10 V) 
D) +10 V 
E) 0 V

Question 9

A capacitor in a single-loop RC circuit is charged to 85% of its final potential difference in 2.4 s.What is the time constant for this circuit?

Accepted Answer

A) 1.5 s 
B) 1.3 s 
C) 1.7 s 
D) 1.9 s 
E) 2.9 s 
A) 1.5 s 
B) 1.3 s 
C) 1.7 s 
D) 1.9 s 
E) 2.9 s

In a loop in a closed circuit, the sum of the currents entering a junction equals the sum of the currents leaving a junction because:

Which two circuits are exactly equivalent?

An initially uncharged 10- $\mu$ F capacitor is charged by a 10-V battery through a resistance R.The capacitor reaches a potential difference of 4 V in a period of 3 s after the charging began.Find the value of R.

The circuit below contains 3100-W light bulbs and a capacitor.The emf is 110 V.Which light bulb(s) is(are) brightest? (Assume the capacitor is fully charged.)

The capacitors are completely discharged in the circuit shown below. The two resistors have the same resistance R and the two capacitors have the same capacitance C.After the switch is closed, the current:

Determine the magnitude and sense (direction) of the current in the 500- $\Omega$ resistor when I = 30 mA. $Determine the magnitude and sense (direction) of the current in the 500- \Omega resistor when I = 30 mA.$

What is the equivalent resistance between points A and B in the figure when R = 18 $\Omega$ ? $What is the equivalent resistance between points A and B in the figure when R = 18 \Omega ?$

Determine the potential difference Va - Vb shown in the circuit below.

A capacitor in a single-loop RC circuit is charged to 85% of its final potential difference in 2.4 s.What is the time constant for this circuit?

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Quantum Physics of Molecules and Solids

Nuclei and Radioactivity

Particle Physics

Filters

Exam 6: Direct-Current Circuits

In a loop in a closed circuit, the sum of the currents entering a junction equals the sum of the currents leaving a junction because:

Which two circuits are exactly equivalent?

An initially uncharged 10- μ\muμ F capacitor is charged by a 10-V battery through a resistance R.The capacitor reaches a potential difference of 4 V in a period of 3 s after the charging began.Find the value of R.

The circuit below contains 3100-W light bulbs and a capacitor.The emf is 110 V.Which light bulb(s) is(are) brightest? (Assume the capacitor is fully charged.)

The capacitors are completely discharged in the circuit shown below. The two resistors have the same resistance R and the two capacitors have the same capacitance C.After the switch is closed, the current:

Determine the magnitude and sense (direction) of the current in the 500- Ω\OmegaΩ resistor when I = 30 mA.

What is the equivalent resistance between points A and B in the figure when R = 18 Ω\OmegaΩ ?

Determine the potential difference Va - Vb shown in the circuit below.

A capacitor in a single-loop RC circuit is charged to 85% of its final potential difference in 2.4 s.What is the time constant for this circuit?

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Quantum Physics of Molecules and Solids

Nuclei and Radioactivity

Particle Physics

Filters

An initially uncharged 10- $\mu$ F capacitor is charged by a 10-V battery through a resistance R.The capacitor reaches a potential difference of 4 V in a period of 3 s after the charging began.Find the value of R.

Determine the magnitude and sense (direction) of the current in the 500- $\Omega$ resistor when I = 30 mA. $Determine the magnitude and sense (direction) of the current in the 500- \Omega resistor when I = 30 mA.$

What is the equivalent resistance between points A and B in the figure when R = 18 $\Omega$ ? $What is the equivalent resistance between points A and B in the figure when R = 18 \Omega ?$