Question 1

A charge undergoes an acceleration. The tangential component of the electric field produced during the acceleration is

Accepted Answer

A)  a maximum in the direction of the acceleration. 
B)  larger than the radial component. 
C)  decreasing in a manner that is proportional to 1/r2 from the source. 
D)  All of the above answers are correct. 
E)  None of the above answers is correct. 
A)  a maximum in the direction of the acceleration. 
B)  larger than the radial component. 
C)  decreasing in a manner that is proportional to 1/r2 from the source. 
D)  All of the above answers are correct. 
E)  None of the above answers is correct. E

Question 2

The following electromagnetic radiation has a wavelength that is closest to the size of automobile:

Accepted Answer

A)  Radio waves 
B)  Infrared radiation 
C)  Visible radiation 
D)  Ultraviolet radiation 
A)  Radio waves 
B)  Infrared radiation 
C)  Visible radiation 
D)  Ultraviolet radiation A

Question 3

An electromagnetic wave has an electric field given by $\vec { E } = - \left( 9.0 \times 10 ^ { 5 } \mathrm {~V} / \mathrm { m } \right) \hat { j } \cos \left[ \left( 9.42 \times 10 ^ { 15 } \mathrm { rad } / \mathrm { s } \right) t - k z \right]$ . The axis of polarization of the wave is

Accepted Answer

A)  $\hat { k }$ 
B)  $\hat { j }$ 
C)  - $\hat { j }$ 
D)  $\hat { i }$ 
A)  $\hat { k }$ 
B)  $\hat { j }$ 
C)  - $\hat { j }$ 
D)  $\hat { i }$ B

Question 4

An electromagnetic wave has an electric field given by $\vec { E } = - \left( 9.0 \times 10 ^ { 5 } \mathrm {~V} / \mathrm { m } \right) \hat { j } \cos \left[ \left( 9.42 \times 10 ^ { 15 } \mathrm { rad } / \mathrm { s } \right) t - k z \right]$ . The magnitude of the magnetic field associated with this wave is

Accepted Answer

A)  $1.0 \times 10 ^ { - 3 } \mathrm {~T}$ 
B)  $2.0 \times 10 ^ { - 3 } \mathrm {~T}$ 
C)  $3.0 \times 10 ^ { - 3 } \mathrm {~T}$ 
D)  $6.0 \times 10 ^ { - 3 } \mathrm {~T}$ 
A)  $1.0 \times 10 ^ { - 3 } \mathrm {~T}$ 
B)  $2.0 \times 10 ^ { - 3 } \mathrm {~T}$ 
C)  $3.0 \times 10 ^ { - 3 } \mathrm {~T}$ 
D)  $6.0 \times 10 ^ { - 3 } \mathrm {~T}$

Question 5

A satellite 300 km above the surface of the Earth emits a radio wave pulse ( $\lambda$ = 25m). The transit time for the wave to reach the surface of the Earth is

Accepted Answer

A)  1 $\mu$ s. 
B)  10 $\mu$ s. 
C)  100 $\mu$ s. 
D)  1 ms. 
A)  1 $\mu$ s. 
B)  10 $\mu$ s. 
C)  100 $\mu$ s. 
D)  1 ms.

Question 6

A 4.0-A current is charging a 10.0-mF capacitor. The total displacement current between the capacitor plates is

Accepted Answer

A)  4.0 A. 
B)  -4.0 A. 
C)  0 A. 
D)  Not enough information is given to solve this problem. 
A)  4.0 A. 
B)  -4.0 A. 
C)  0 A. 
D)  Not enough information is given to solve this problem.

Question 7

A pressure of $15 \times 10 ^ { - 6 } \mathrm {~N} / \mathrm { m } ^ { 2 }$ is due to sunlight being reflected from a surface of a "solar sail." The energy flux incident on the surface is

Accepted Answer

A)  1125 W/m2. 
B)  2250 W/m2. 
C)  4500 W/m2. 
D)  9000 W/m2. 
A)  1125 W/m2. 
B)  2250 W/m2. 
C)  4500 W/m2. 
D)  9000 W/m2.

Question 8

Consider a 150-W incandescent lightbulb that radiates light in all directions. At a distance of 1.5 m the amplitude of the oscillating magnetic field B0 is

Accepted Answer

A)  $2.6 \times 10 ^ { - 7 } \mathrm {~T}$ 
B)  $2.1 \times 10 ^ { - 7 } \mathrm {~T}$ 
C)  $7.5 \times 10 ^ { - 7 } \mathrm {~T}$ 
D)  $1.3 \times 10 ^ { - 7 } \mathrm {~T}$ 
A)  $2.6 \times 10 ^ { - 7 } \mathrm {~T}$ 
B)  $2.1 \times 10 ^ { - 7 } \mathrm {~T}$ 
C)  $7.5 \times 10 ^ { - 7 } \mathrm {~T}$ 
D)  $1.3 \times 10 ^ { - 7 } \mathrm {~T}$

Question 9

Given that the sun's intensity at the Earth's surface is 1350 W/m2, the amount of electrical energy in a cubic meter at the Earth's surface is

Accepted Answer

A)  $1.5 \times 10 ^ { - 6 } \mathrm {~J}$ 
B)  $3.0 \times 10 ^ { - 6 } \mathrm {~J}$ 
C)  $4.5 \times 10 ^ { - 6 } \mathrm {~J}$ 
D)  $6.0 \times 10 ^ { - 6 } \mathrm {~J}$ 
A)  $1.5 \times 10 ^ { - 6 } \mathrm {~J}$ 
B)  $3.0 \times 10 ^ { - 6 } \mathrm {~J}$ 
C)  $4.5 \times 10 ^ { - 6 } \mathrm {~J}$ 
D)  $6.0 \times 10 ^ { - 6 } \mathrm {~J}$

Question 10

The speed of radio waves traveling in a vacuum depends on

Accepted Answer

A)  the wavelength of the waves. 
B)  the frequency of the waves. 
C)  the polarization of the waves. 
D)  none of the above. 
A)  the wavelength of the waves. 
B)  the frequency of the waves. 
C)  the polarization of the waves. 
D)  none of the above.

Question 11

The direction of propagation of an electromagnetic wave is given by

Accepted Answer

A)  $\vec { E } \cdot \vec { B }$ 
B)  $- \vec { E } \cdot \vec { B }$ 
C)  $\vec { E } \times \vec { B }$ 
D)  $\vec { B } \times \vec { E }$ 
A)  $\vec { E } \cdot \vec { B }$ 
B)  $- \vec { E } \cdot \vec { B }$ 
C)  $\vec { E } \times \vec { B }$ 
D)  $\vec { B } \times \vec { E }$

Question 12

An electromagnetic wave has an electric field given by $\vec { E } = - \left( 9.0 \times 10 ^ { 5 } \mathrm {~V} / \mathrm { m } \right) \hat { j } \cos \left[ \left( 9.42 \times 10 ^ { 15 } \mathrm { rad } / \mathrm { s } \right) t - k z \right]$ . The direction of the polarization of the magnetic field associated with this wave is

Accepted Answer

A)  $\hat { j }$ 
B)  $\hat { k }$ 
C)  $\hat { i }$ 
D)  Hold on. The wave is not polarized. 
A)  $\hat { j }$ 
B)  $\hat { k }$ 
C)  $\hat { i }$ 
D)  Hold on. The wave is not polarized.

Question 13

Maxwell's equations are a compilation of the fundamental laws needed for a complete mathematical description of the behavior of electric and magnetic fields. The equation that mathematically reflects that there are no isolated magnetic poles is

Accepted Answer

A)  $\oint \vec { E } \cdot d \vec { A } = \frac { Q _ { \text {inside } } } { \varepsilon _ { 0 } }$ 
B)  $\oint \vec { B } \cdot d \vec { A } = 0$ 
C)  $\oint \vec { E } \cdot d \vec { s } = - \frac { d \Phi _ { B } } { d t }$ 
D)  $\oint \vec { B } \cdot d \vec { s } = \mu _ { 0 } I + \mu _ { 0 } \varepsilon _ { 0 } \frac { d \Phi _ { E } } { d t }$ 
A)  $\oint \vec { E } \cdot d \vec { A } = \frac { Q _ { \text {inside } } } { \varepsilon _ { 0 } }$ 
B)  $\oint \vec { B } \cdot d \vec { A } = 0$ 
C)  $\oint \vec { E } \cdot d \vec { s } = - \frac { d \Phi _ { B } } { d t }$ 
D)  $\oint \vec { B } \cdot d \vec { s } = \mu _ { 0 } I + \mu _ { 0 } \varepsilon _ { 0 } \frac { d \Phi _ { E } } { d t }$

Question 14

An electromagnetic wave has an electric field given by $\vec { E } = - \left( 9.0 \times 10 ^ { 5 } \mathrm {~V} / \mathrm { m } \right) \hat { j } \cos \left[ \left( 9.42 \times 10 ^ { 15 } \mathrm { rad } / \mathrm { s } \right) t - k z \right]$ . The frequency of the wave is

Accepted Answer

A)  $9.42 \times 10 ^ { 15 } \mathrm {~Hz}$ 
B)  $9.42 \times 10 ^ { 15 } \mathrm { rad } / \mathrm { s }$ 
C)  $1.5 \times 10 ^ { 15 } \mathrm {~Hz}$ 
D)  $9.0 \times 10 ^ { 5 } \mathrm {~V} / \mathrm { m }$ 
A)  $9.42 \times 10 ^ { 15 } \mathrm {~Hz}$ 
B)  $9.42 \times 10 ^ { 15 } \mathrm { rad } / \mathrm { s }$ 
C)  $1.5 \times 10 ^ { 15 } \mathrm {~Hz}$ 
D)  $9.0 \times 10 ^ { 5 } \mathrm {~V} / \mathrm { m }$

Question 15

The functional dependence of the radial component of the field produced by an accelerating charge as a function of distance from the charge is proportional to

Accepted Answer

A)  r. 
B)  1/r. 
C)  r2. 
D)  1/r2. 
E)  none of the above. 
A)  r. 
B)  1/r. 
C)  r2. 
D)  1/r2. 
E)  none of the above.

Question 16

The Maxwell-Ampere Law can be written as; $\oint \vec { B } \cdot d \vec { s } = \mu _ { 0 } I + \mu _ { 0 } \varepsilon _ { 0 } \frac { d \Phi _ { E } } { d t }$ . The term in the equation that relates to the magnetic field produced by an electric current is

Accepted Answer

A)  $\oint \vec { B } \cdot d \vec { s }$ 
B)  $\mu _ { 0 } I$ 
C)  $\mu _ { 0 } \varepsilon _ { 0 } \frac { d \Phi _ { E } } { d t }$ 
D)  No term in this equation is related to the displacement current. 
A)  $\oint \vec { B } \cdot d \vec { s }$ 
B)  $\mu _ { 0 } I$ 
C)  $\mu _ { 0 } \varepsilon _ { 0 } \frac { d \Phi _ { E } } { d t }$ 
D)  No term in this equation is related to the displacement current.

Question 17

At a given point the electric field is 0.25 V/m. The energy flux at this point is

Accepted Answer

A)  1.7 $\times$
 10-4 W/m2. 
B)  2.8 $\times$
 10-4 W/m2. 
C)  8.2 $\times$
 10-4 W/m2. 
D)  8.2 $\times$
 10-5 W/m2. 
A)  1.7 $\times$
 10-4 W/m2. 
B)  2.8 $\times$
 10-4 W/m2. 
C)  8.2 $\times$
 10-4 W/m2. 
D)  8.2 $\times$
 10-5 W/m2.

Question 18

The magnetic field component of an electromagnetic wave is 25 $\mu \mathrm { T }$ . The electric energy density of the wave is

Accepted Answer

A)  $2.5 \times 10 ^ { - 4 } \mathrm {~J} / \mathrm { m } ^ { 3 }$ 
B)  $2.5 \times 10 ^ { - 4 } \mathrm {~J} / \mathrm { m } ^ { 2 }$ 
C)  $2.5 \times 10 ^ { - 2 } \mathrm {~J} / \mathrm { m } ^ { 3 }$ 
D)  $2.5 \times 10 ^ { - 2 } \mathrm {~J} / \mathrm { m } ^ { 2 }$ 
A)  $2.5 \times 10 ^ { - 4 } \mathrm {~J} / \mathrm { m } ^ { 3 }$ 
B)  $2.5 \times 10 ^ { - 4 } \mathrm {~J} / \mathrm { m } ^ { 2 }$ 
C)  $2.5 \times 10 ^ { - 2 } \mathrm {~J} / \mathrm { m } ^ { 3 }$ 
D)  $2.5 \times 10 ^ { - 2 } \mathrm {~J} / \mathrm { m } ^ { 2 }$

Question 19

Radiation from a source is striking a surface at a rate of 50 W/m2. The peak value of the electric field is

Accepted Answer

A)  110 V/m. 
B)  150 V/m. 
C)  190 V/m. 
D)  250 V/m. 
A)  110 V/m. 
B)  150 V/m. 
C)  190 V/m. 
D)  250 V/m.

Question 20

The frequency of an electromagnetic wave is $2.0 \times 10 ^ { 14 } \mathrm {~Hz}$ . The wavelength of this wave is

Accepted Answer

A)  150 nm. 
B)  67 mm. 
C)  1500 nm. 
D)  670 nm. 
A)  150 nm. 
B)  67 mm. 
C)  1500 nm. 
D)  670 nm.

Exam 33: Electromagnetic Waves

A charge undergoes an acceleration. The tangential component of the electric field produced during the acceleration is

The following electromagnetic radiation has a wavelength that is closest to the size of automobile:

A satellite 300 km above the surface of the Earth emits a radio wave pulse ( λ\lambdaλ = 25m). The transit time for the wave to reach the surface of the Earth is

A 4.0-A current is charging a 10.0-mF capacitor. The total displacement current between the capacitor plates is

A pressure of 15×10−6 N/m215 \times 10 ^ { - 6 } \mathrm {~N} / \mathrm { m } ^ { 2 }15×10−6 N/m2 is due to sunlight being reflected from a surface of a "solar sail." The energy flux incident on the surface is

Consider a 150-W incandescent lightbulb that radiates light in all directions. At a distance of 1.5 m the amplitude of the oscillating magnetic field B0 is

Given that the sun's intensity at the Earth's surface is 1350 W/m2, the amount of electrical energy in a cubic meter at the Earth's surface is

The speed of radio waves traveling in a vacuum depends on

The direction of propagation of an electromagnetic wave is given by

Maxwell's equations are a compilation of the fundamental laws needed for a complete mathematical description of the behavior of electric and magnetic fields. The equation that mathematically reflects that there are no isolated magnetic poles is

The functional dependence of the radial component of the field produced by an accelerating charge as a function of distance from the charge is proportional to

At a given point the electric field is 0.25 V/m. The energy flux at this point is

The magnetic field component of an electromagnetic wave is 25 μT\mu \mathrm { T }μT . The electric energy density of the wave is

Radiation from a source is striking a surface at a rate of 50 W/m2. The peak value of the electric field is

The frequency of an electromagnetic wave is 2.0×1014 Hz2.0 \times 10 ^ { 14 } \mathrm {~Hz}2.0×1014 Hz . The wavelength of this wave is

Space, Time, and Mass

Motion Along a Straight Line

Vectors

Motion in Two and Three Dimensions

Newtons Laws of Motion

Further Applications of Newtons Laws

Work and Energy

Conservation of Energy

Gravitation

Systems of Particles

Collisions

Rotation of a Rigid Body

Dynamics of a Rigid Body

Statics and Elasticity

Oscillations

Waves

Sound

Fluid Mechanics

The Ideal Gas

Heat

Thermodynamics

Electric Force and the Electric Charge

The Electric Field

Gauss Law

Electrostatic Potential and Energy

Capacitors and Dielectrics

Currents and Ohms Law

Direct Current Circuits

Magnetic Force and Field

Charges and Currents in Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Reflection, Refraction, and Optics

Interference and Diffraction

The Theory of Special Relativity

Quanta of Light

Spectral Lines, Bohrs Theory, and Quantum Mechanics

Quantum Structure of Atoms, Molecules, and Solids

Nuclei

Elementary Particles and Cosmology

Filters

A satellite 300 km above the surface of the Earth emits a radio wave pulse ( $\lambda$ = 25m). The transit time for the wave to reach the surface of the Earth is

A pressure of $15 \times 10 ^ { - 6 } \mathrm {~N} / \mathrm { m } ^ { 2 }$ is due to sunlight being reflected from a surface of a "solar sail." The energy flux incident on the surface is

Consider a 150-W incandescent lightbulb that radiates light in all directions. At a distance of 1.5 m the amplitude of the oscillating magnetic field B₀ is

Given that the sun's intensity at the Earth's surface is 1350 W/m², the amount of electrical energy in a cubic meter at the Earth's surface is

The magnetic field component of an electromagnetic wave is 25 $\mu \mathrm { T }$ . The electric energy density of the wave is

Radiation from a source is striking a surface at a rate of 50 W/m². The peak value of the electric field is

The frequency of an electromagnetic wave is $2.0 \times 10 ^ { 14 } \mathrm {~Hz}$ . The wavelength of this wave is