A 1.90 × 1014 Hz electromagnetic wave propagates in carbon tetrachloride with a speed of 2.05 × 108 m/s.The wavelength of the wave in vacuum is closest to:

A) 1580 nm B) 1080 nm C) 1260 nm D) 1420 nm E) 1740 nm A) 1580 nm B) 1080 nm C) 1260 nm D) 1420 nm E) 1740 nm

The energy flow per unit time per unit area (S)of an electromagnetic wave has an average value of 601 mW/m2.The maximum value of the magnetic field in the wave is closest to:

A) 7.09 × 10-8 T B) 5.02 × 10-8 T C) 3.55 × 10-8T D) 9.81 × 10-8 T E) 1.42 × 10-7 T A) 7.09 × 10-8 T B) 5.02 × 10-8 T C) 3.55 × 10-8T D) 9.81 × 10-8 T E) 1.42 × 10-7 T

Exam 25: Electromagnetic Induction and Electromagnetic Waves

While a magnet is moved toward the end of a solenoid,a voltage difference is induced between the two ends of the solenoid wire.The voltage difference would be larger if

(Multiple Choice)

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Question 41

For electromagnetic waves,the electric and magnetic fields are often given in the form of sine waves.Explain how this model of electromagnetic waves does not violate the conservation of energy,especially when the sine functions are zero.

(Essay)

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Question 42

A transmitter is operating at an average of 4.00 kW of power.What is the average intensity of the signal 8.00 km from the transmitter?

(Multiple Choice)

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Question 43

Unpolarized light passes through three polarizing filters.The first is oriented with a horizontal transmission axis,the second has its transmission axis π/7 radians from the horizontal,and the third has a vertical transmission axis.What percent of the light gets through?

(Multiple Choice)

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Question 44

A 1.90 × 10¹⁴ Hz electromagnetic wave propagates in carbon tetrachloride with a speed of 2.05 × 10⁸ m/s.The wavelength of the wave in vacuum is closest to:

(Multiple Choice)

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Question 45

A large magnetic flux change through a coil must induce a greater emf in this coil than a small flux change.

(True/False)

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Question 46

An 800 kHz radio signal is detected at a point 2.1 km distant from a transmitter tower.The electric field amplitude of the signal at that point is 800 mV/m.Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed.The intensity of the radio signal at that point is closest to:

(Multiple Choice)

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Question 47

-In the figure,two solenoids are in line.The switch S,initially closed,is opened.The polarity of the induced emf in terminals X and Y is:

(Multiple Choice)

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Question 48

It requires work to push a coil between the poles of a horseshoe magnet,and it also requires additional work to pull that coil out again.

(True/False)

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Question 49

A beam of light is linearly polarized in a vertical plane and has an intensity Io.The beam passes through an ideal polarizer and then through an ideal analyzer whose axis is set horizontally.The axis of the polarizer is set at 60° with the vertical.The ratio of the intensity of the final beam to I_o is closest to:

(Multiple Choice)

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Question 50

Polarized light passes through a polarizer.If the electric vector of the polarized light is horizontal what,in terms of the initial intensity S_o,is the intensity of the light that passes through a polarizer if the polarizer is tilted 0.393 rad from the horizontal?

(Multiple Choice)

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Question 51

A magnet,with its north pole pointed downwards,is falling down directly above a wire loop.As the magnet approaches the wire loop (before it passes through the loop),

(Multiple Choice)

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Question 52

A circular wire ring is situated above a long straight wire,as shown in the figure.The straight wire has a current flowing to the right,and the current is increasing in time at a constant rate.Which statement is true?

(Multiple Choice)

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Question 53

-In the figure,a long bar slides on two contact points and is in motion with velocity ν.A steady,uniform,magnetic field B is present.The induced current through the resistor R is:

(Multiple Choice)

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Question 54

Which type of electromagnetic wave travels through space the slowest?

(Multiple Choice)

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Question 55

What is the radius of a tightly wound solenoid of circular cross-section that has 180 turns if a change in its internal magnetic field of 3.0 T/s causes a 6.0 A current to flow? The resistance of the circuit that contains the solenoid is 17 Ω.The only emf source for the circuit is the induced emf.

(Multiple Choice)

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Question 56

-In the figure,a straight wire carries a steady current I.A bar is in contact with a pair of circular rails and rotates about the straight wire.The induced current through the resistor R is:

(Multiple Choice)

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Question 57

A conductor is formed into a loop that encloses an area of 1.0 m².The loop is oriented at a 30.0º angle with the xy-plane.A varying magnetic field is oriented parallel to the z-axis.If the maximum emf induced in the loop is 25.0 V,what is the maximum rate at which the magnetic field strength is changing?

(Multiple Choice)

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Question 58

The energy flow per unit time per unit area (S)of an electromagnetic wave has an average value of 601 mW/m².The maximum value of the magnetic field in the wave is closest to:

(Multiple Choice)

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Question 59

-In the figure,a wire and a 10 Ω resistor are used to form a circuit in the shape of a square, 20 cm by 20 cm.A uniform but nonsteady magnetic field is directed into the plane of the circuit.The magnitude of the magnetic field is decreased from 2.70 T to 0.90 T in a time interval of 96 ms.The average induced current and its direction through the resistor,in this time interval,are closest to:

(Multiple Choice)

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Question 60

Showing 41 - 60 of 66

Exam 25: Electromagnetic Induction and Electromagnetic Waves

While a magnet is moved toward the end of a solenoid,a voltage difference is induced between the two ends of the solenoid wire.The voltage difference would be larger if

For electromagnetic waves,the electric and magnetic fields are often given in the form of sine waves.Explain how this model of electromagnetic waves does not violate the conservation of energy,especially when the sine functions are zero.

A transmitter is operating at an average of 4.00 kW of power.What is the average intensity of the signal 8.00 km from the transmitter?

Unpolarized light passes through three polarizing filters.The first is oriented with a horizontal transmission axis,the second has its transmission axis π/7 radians from the horizontal,and the third has a vertical transmission axis.What percent of the light gets through?

A 1.90 × 1014 Hz electromagnetic wave propagates in carbon tetrachloride with a speed of 2.05 × 108 m/s.The wavelength of the wave in vacuum is closest to:

A large magnetic flux change through a coil must induce a greater emf in this coil than a small flux change.

-In the figure,two solenoids are in line.The switch S,initially closed,is opened.The polarity of the induced emf in terminals X and Y is:

It requires work to push a coil between the poles of a horseshoe magnet,and it also requires additional work to pull that coil out again.

Polarized light passes through a polarizer.If the electric vector of the polarized light is horizontal what,in terms of the initial intensity So,is the intensity of the light that passes through a polarizer if the polarizer is tilted 0.393 rad from the horizontal?

A magnet,with its north pole pointed downwards,is falling down directly above a wire loop.As the magnet approaches the wire loop (before it passes through the loop),

A circular wire ring is situated above a long straight wire,as shown in the figure.The straight wire has a current flowing to the right,and the current is increasing in time at a constant rate.Which statement is true?

-In the figure,a long bar slides on two contact points and is in motion with velocity ν.A steady,uniform,magnetic field B is present.The induced current through the resistor R is:

Which type of electromagnetic wave travels through space the slowest?

What is the radius of a tightly wound solenoid of circular cross-section that has 180 turns if a change in its internal magnetic field of 3.0 T/s causes a 6.0 A current to flow? The resistance of the circuit that contains the solenoid is 17 Ω.The only emf source for the circuit is the induced emf.

-In the figure,a straight wire carries a steady current I.A bar is in contact with a pair of circular rails and rotates about the straight wire.The induced current through the resistor R is:

The energy flow per unit time per unit area (S)of an electromagnetic wave has an average value of 601 mW/m2.The maximum value of the magnetic field in the wave is closest to:

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A 1.90 × 10¹⁴ Hz electromagnetic wave propagates in carbon tetrachloride with a speed of 2.05 × 10⁸ m/s.The wavelength of the wave in vacuum is closest to:

Polarized light passes through a polarizer.If the electric vector of the polarized light is horizontal what,in terms of the initial intensity S_o,is the intensity of the light that passes through a polarizer if the polarizer is tilted 0.393 rad from the horizontal?

The energy flow per unit time per unit area (S)of an electromagnetic wave has an average value of 601 mW/m².The maximum value of the magnetic field in the wave is closest to: