Question 1

Which one of the following expressions is the correct representation for the speed of light in vacuum?

Accepted Answer

A)  $\sqrt { \varepsilon _ { 0 } \mu _ { 0 } }$ 
B)  $\sqrt { \varepsilon _ { 0 } / \mu 0 }$ 
C)  $\sqrt { \mu 0 / \varepsilon 0 }$ 
D)  1 / $\sqrt { \varepsilon _ { 0 } \mu _ { 0 } }$ 
E)  1 / ε0μ0 
A)  $\sqrt { \varepsilon _ { 0 } \mu _ { 0 } }$ 
B)  $\sqrt { \varepsilon _ { 0 } / \mu 0 }$ 
C)  $\sqrt { \mu 0 / \varepsilon 0 }$ 
D)  1 / $\sqrt { \varepsilon _ { 0 } \mu _ { 0 } }$ 
E)  1 / ε0μ0

Question 2

A bar magnet is oriented above a copper ring, as shown in the figure. If the magnet is pulled upward, what is the direction of the current induced in the ring, as viewed from above?

Accepted Answer

A)  There is no current in the ring. 
B)  counterclockwise 
C)  clockwise 
A)  There is no current in the ring. 
B)  counterclockwise 
C)  clockwise

Question 3

The three loops of wire shown in the figure are all hanging in the same uniform magnetic field $\overrightarrow { \mathrm { B } }$ that is perpendicular to the page and does not vary with time. Loop 1 swings back and forth like the bob in a pendulum, Loop 2 rotates about a vertical axis, and Loop 3 oscillates up and down at the end of a spring. Which loop (or loops) will have an emf induced in them?

Accepted Answer

A)  Loop 1 
B)  Loop 2 
C)  Loop 3 
D)  Loops 1 and 3 
E)  Loops 2 and 3 
A)  Loop 1 
B)  Loop 2 
C)  Loop 3 
D)  Loops 1 and 3 
E)  Loops 2 and 3

Question 4

A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ∙ s)

Accepted Answer

Question 5

A round flat metal coil has 180 turns and negligible resistance. It is connected in a series circuit with a $17 - \Omega$ resistor, with nothing else in the circuit. You measure that a $6.0 - \mathrm { A }$ current flows through the resistor when a magnetic field through the coil, perpendicular to its area, is changing at $3.0 \mathrm {~T} / \mathrm { s }$ What is the radius of the coil?

Accepted Answer

A)  0.25 m 
B)  0.014 m 
C)  0.54 m 
D)  0.043 m 
A)  0.25 m 
B)  0.014 m 
C)  0.54 m 
D)  0.043 m

Which one of the following expressions is the correct representation for the speed of light in vacuum?

A bar magnet is oriented above a copper ring, as shown in the figure. If the magnet is pulled upward, what is the direction of the current induced in the ring, as viewed from above?

A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s)

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Gravity

Rotational Motion

Equilibrium Ad 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

Electric Potential

Current and Resistance

Circuits

Magnetic Fields and Forces

AC Electricity

Relativity

Quantum Physics

Atoms and Molecules

Nuclear Physics

Filters

Exam 25: EM Induction and Em Waves

Which one of the following expressions is the correct representation for the speed of light in vacuum?

A bar magnet is oriented above a copper ring, as shown in the figure. If the magnet is pulled upward, what is the direction of the current induced in the ring, as viewed from above?

A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ∙ s)

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Gravity

Rotational Motion

Equilibrium Ad 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

Electric Potential

Current and Resistance

Circuits

Magnetic Fields and Forces

AC Electricity

Relativity

Quantum Physics

Atoms and Molecules

Nuclear Physics

Filters

A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s)