Question 1

A 5-cm radius isolated conducting sphere is charged so its potential is +100 V, relative to the potential far away. The charge density on its surface is:

Accepted Answer

A)  +2.2* 10-7 C/m2 
B)  -2.2* 10-7 C/m2 
C)  +3.5 * 10-7 C/m2 
D)  -3.5 * 10-7 C/m2 
E)  +1.8 * 10-8 C/m2 
A)  +2.2* 10-7 C/m2 
B)  -2.2* 10-7 C/m2 
C)  +3.5 * 10-7 C/m2 
D)  -3.5 * 10-7 C/m2 
E)  +1.8 * 10-8 C/m2

Question 2

An electron is accelerated from rest through a potential difference V. Its final speed is proportional to:

Accepted Answer

A)  V 
B)  V2 
C)    
D)  1/V 
E)    
A)  V 
B)  V2 
C)    
D)  1/V 
E)

Question 3

Two identical particles, each with charge q, are placed on the x axis, one at the origin and the other at x = 5 cm. A third particle, with charge -q, is placed on the x axis so the potential energy of the three-particle system is the same as the potential energy at infinite separation. Its x coordinate is:

Accepted Answer

A)  13 cm 
B)  2.5 cm 
C)  7.5 cm 
D)  10 cm 
E)  -5 cm 
A)  13 cm 
B)  2.5 cm 
C)  7.5 cm 
D)  10 cm 
E)  -5 cm

Question 4

A hollow conductor is positively charged. A small uncharged metal ball is lowered by a silk thread through a small opening in the top of the conductor and allowed to touch its inner surface. After the ball is removed, it will have:

Accepted Answer

A)  a positive charge 
B)  a negative charge 
C)  no appreciable charge 
D)  a charge whose sign depends on what part of the inner surface it touched 
E)  a charge whose sign depends on where the small hole is located in the conductor 
A)  a positive charge 
B)  a negative charge 
C)  no appreciable charge 
D)  a charge whose sign depends on what part of the inner surface it touched 
E)  a charge whose sign depends on where the small hole is located in the conductor

Exam 24: Electric Potential

A 5-cm radius isolated conducting sphere is charged so its potential is +100 V, relative to the potential far away. The charge density on its surface is:

An electron is accelerated from rest through a potential difference V. Its final speed is proportional to:

A hollow conductor is positively charged. A small uncharged metal ball is lowered by a silk thread through a small opening in the top of the conductor and allowed to touch its inner surface. After the ball is removed, it will have:

Measurement

Motion Along a Straight Line

Vector

Motion in Two and Three Dimensions

Force and Motion I

Force and Motion II

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Fluids

Oscillations

Waves I

Waves II

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Electric Charge

Electric Fields

Gauss Law

Capacitance

Current and Resistance

Circuits

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Nuclear Physics

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

Filters