In an electric trolley or bus system, the vehicle’s motor draws current from an overhead wire by means of a long arm with an attachment at the end that slides along the overhead wire. A brilliant electric spark is often seen when the attachment crosses a junction in the wires where contact is momentarily lost. Explain this phenomenon.

Question

Want to see more full solutions like this?

Answer 1

Textbook Question

Chapter 30, Problem Q30.1DQ

In an electric trolley or bus system, the vehicle’s motor draws current from an overhead wire by means of a long arm with an attachment at the end that slides along the overhead wire. A brilliant electric spark is often seen when the attachment crosses a junction in the wires where contact is momentarily lost. Explain this phenomenon.

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Students have asked these similar questions

Three point-like charges in the attached image are placed at the corners of an equilateral triangle as shown in the figure. Each side of the triangle has a length of 38.0 cm, and the point (C) is located half way between q1 and q3 along the side. Find the magnitude of the electric field at point (C). Let q1 = −2.80 µC, q2 = −3.40 µC, and q3 = −4.50 µC. Thank you.

Three point-like charges are placed as shown in the attach image, where r1 = r2 = 44.0 cm. Find the magnitude of the electric force exerted on the charge q3. Let q1 = -1.90 uC, q2 = -2.60 uC, and q3 = +3.60 uC. Thank you.

The drawing attached shows an edge-on view of two planar surfaces that intersect and are mutually perpendicular. Surface (1) has an area of 1.90 m², while Surface (2) has an area of 3.90 m². The electric field in magnitude of 215 N/C. Find the magnitude of the electric flux through surface (1 and 2 combined) if the angle theta made between the electric field with surface (2) is 30.0 degrees. Thank you.

Answer 2

Textbook Question

Chapter 30, Problem Q30.1DQ

In an electric trolley or bus system, the vehicle’s motor draws current from an overhead wire by means of a long arm with an attachment at the end that slides along the overhead wire. A brilliant electric spark is often seen when the attachment crosses a junction in the wires where contact is momentarily lost. Explain this phenomenon.

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Textbook Question

Chapter 30, Problem Q30.1DQ

In an electric trolley or bus system, the vehicle’s motor draws current from an overhead wire by means of a long arm with an attachment at the end that slides along the overhead wire. A brilliant electric spark is often seen when the attachment crosses a junction in the wires where contact is momentarily lost. Explain this phenomenon.

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 30, Problem Q30.1DQ

In an electric trolley or bus system, the vehicle’s motor draws current from an overhead wire by means of a long arm with an attachment at the end that slides along the overhead wire. A brilliant electric spark is often seen when the attachment crosses a junction in the wires where contact is momentarily lost. Explain this phenomenon.

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Answer 8

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

To determine

the phenomenon used in electric trolley system.

Answer 12

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Answer 13

Ch. 30 - In an electric trolley or bus system, the vehicles...Ch. 30 - From Eq. (30.5) 1 H = 1 Wb/A. and from Eqs. (30.4)...Ch. 30 - Prob. Q30.3DQ Ch. 30 - Prob. Q30.4DQ Ch. 30 - Prob. Q30.5DQ Ch. 30 - Two closely wound circular coils have the same...Ch. 30 - Prob. Q30.7DQ Ch. 30 - For the same magnetic field strength B, is the...Ch. 30 - Prob. Q30.9DQ Ch. 30 - A Differentiating Circuit. The current in a...

Videos

Explanation of Solution

Want to see more full solutions like this?

Chapter 30 Solutions

Additional Science Textbook Solutions