Question 1

The capacitance of a capacitor depends on

Accepted Answer

A) the charge on it. 
B) the potential difference across it. 
C) the energy stored in it. 
D) More than one of these 
E) None of these 
A) the charge on it. 
B) the potential difference across it. 
C) the energy stored in it. 
D) More than one of these 
E) None of these

Question 2

A hydrogen atom consists of a proton and an electron.If the orbital radius of the electron increases,the potential energy of the electron

Accepted Answer

A) increases. 
B) decreases. 
C) remains the same. 
D) depends on the zero point of the potential. 
A) increases. 
B) decreases. 
C) remains the same. 
D) depends on the zero point of the potential.

Question 3

A proton is projected toward a fixed nucleus of charge +Ze with velocity vo.Initially the two particles are very far apart.When the proton is a distance R from the nucleus its velocity has decreased to 1/2 vo.How far from the nucleus will the proton be when its velocity has dropped to 1/4 vo?

Accepted Answer

A) 1/16 R 
B) 1/4 R 
C) 1/2 R 
D) 4/5 R 
E) None of these 
A) 1/16 R 
B) 1/4 R 
C) 1/2 R 
D) 4/5 R 
E) None of these

Question 4

A 100.0 pF capacitor consists of two circular plates of radius 0.40 mm.How far apart are the plates? (The value of εo is 8.85 F1F1F1S1F1F1F10 10-12 C2/N·m2. )

Accepted Answer

A) 0.044 μm 
B) 0.022 μm 
C) 0.0050 μm 
D) 0.0025 μm 
A) 0.044 μm 
B) 0.022 μm 
C) 0.0050 μm 
D) 0.0025 μm

Question 5

Point charges,Q1 = +46 nC and Q2 = -75 nC,are placed as shown.In the figure,an external force transports an electron from point A to point B.The work done by the external force is closest to:

Accepted Answer

A) + 730 eV 
B) + 610 eV 
C) + 480 eV 
D) - 730 eV 
E) - 480 eV 
A) + 730 eV 
B) + 610 eV 
C) + 480 eV 
D) - 730 eV 
E) - 480 eV

Question 6

An electron was accelerated from rest through a potential difference of 9900 V.What is its speed?

Accepted Answer

A) 5.9 × 107 m/s 
B) 4.9 × 107 m/s 
C) 3.9 × 107 m/s 
D) 2.9 × 107 m/s 
A) 5.9 × 107 m/s 
B) 4.9 × 107 m/s 
C) 3.9 × 107 m/s 
D) 2.9 × 107 m/s

The capacitance of a capacitor depends on

A hydrogen atom consists of a proton and an electron.If the orbital radius of the electron increases,the potential energy of the electron

A proton is projected toward a fixed nucleus of charge +Ze with velocity vo.Initially the two particles are very far apart.When the proton is a distance R from the nucleus its velocity has decreased to 1/2 v_o.How far from the nucleus will the proton be when its velocity has dropped to 1/4 v_o?

A 100.0 pF capacitor consists of two circular plates of radius 0.40 mm.How far apart are the plates? (The value of εo is 8.85  10-12 C²/N·m². )

Point charges,Q₁ = +46 nC and Q₂ = -75 nC,are placed as shown.In the figure,an external force transports an electron from point A to point B.The work done by the external force is closest to:

An electron was accelerated from rest through a potential difference of 9900 V.What is its speed?

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Circular Motion,orbits,and Gravity

Rotational Motion

Equilibrium and Elasticity

Momentum

Energy and Work

Using Energy

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Current and Resistance

Circuits

Magnetic Fields and Forces

Electromagnetic Induction and Electromagnetic Waves

Ac Electricity

Relativity

Quantum Physics

Atoms and Molecules

Nuclear Physics

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Exam 21: Electric Potential

The capacitance of a capacitor depends on

A hydrogen atom consists of a proton and an electron.If the orbital radius of the electron increases,the potential energy of the electron

A proton is projected toward a fixed nucleus of charge +Ze with velocity vo.Initially the two particles are very far apart.When the proton is a distance R from the nucleus its velocity has decreased to 1/2 vo.How far from the nucleus will the proton be when its velocity has dropped to 1/4 vo?

A 100.0 pF capacitor consists of two circular plates of radius 0.40 mm.How far apart are the plates? (The value of εo is 8.85  10-12 C2/N·m2. )

Point charges,Q1 = +46 nC and Q2 = -75 nC,are placed as shown.In the figure,an external force transports an electron from point A to point B.The work done by the external force is closest to:

An electron was accelerated from rest through a potential difference of 9900 V.What is its speed?

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Circular Motion,orbits,and Gravity

Rotational Motion

Equilibrium and Elasticity

Momentum

Energy and Work

Using Energy

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Current and Resistance

Circuits

Magnetic Fields and Forces

Electromagnetic Induction and Electromagnetic Waves

Ac Electricity

Relativity

Quantum Physics

Atoms and Molecules

Nuclear Physics

Filters

A proton is projected toward a fixed nucleus of charge +Ze with velocity vo.Initially the two particles are very far apart.When the proton is a distance R from the nucleus its velocity has decreased to 1/2 v_o.How far from the nucleus will the proton be when its velocity has dropped to 1/4 v_o?

A 100.0 pF capacitor consists of two circular plates of radius 0.40 mm.How far apart are the plates? (The value of εo is 8.85  10-12 C²/N·m². )

Point charges,Q₁ = +46 nC and Q₂ = -75 nC,are placed as shown.In the figure,an external force transports an electron from point A to point B.The work done by the external force is closest to: