Podcast
Questions and Answers
What is the primary purpose of a set of jumper cables?
What is the primary purpose of a set of jumper cables?
- To boost the voltage in a running vehicle
- To generate a magnetic field
- To measure the current in a circuit
- To start a car with a dead battery (correct)
What is the direction of the force on the black wire due to the current in the red wire?
What is the direction of the force on the black wire due to the current in the red wire?
- In the same direction as the current in the red wire
- Perpendicular to the current in the red wire
- Zero, since the wires are not moving
- In the opposite direction of the current in the red wire (correct)
To find the force on the red wire, what two-step process is used?
To find the force on the red wire, what two-step process is used?
- Find the electric field due to the current in the black wire, then find the torque on the red wire
- Find the force on the black wire, then find the torque on the red wire
- Find the torque on the black wire, then find the force on the red wire
- Find the magnetic field due to the current in the black wire, then find the force on the current in the red wire (correct)
Why is the force on the black wire equal in magnitude but opposite in direction to the force on the red wire?
Why is the force on the black wire equal in magnitude but opposite in direction to the force on the red wire?
What is the effect of increasing the separation distance between the wires on the force between them?
What is the effect of increasing the separation distance between the wires on the force between them?
What is the current in each wire of the jumper cables?
What is the current in each wire of the jumper cables?
What is the direction of the magnetic field at the position of the red wire due to the current in the black wire?
What is the direction of the magnetic field at the position of the red wire due to the current in the black wire?
What is the direction of the force on the red wire?
What is the direction of the force on the red wire?
Why are the forces between currents not an important consideration in most cases?
Why are the forces between currents not an important consideration in most cases?
What is the significance of the direction of the currents in the two wires?
What is the significance of the direction of the currents in the two wires?
What is an example of a situation where the forces between currents are important?
What is an example of a situation where the forces between currents are important?
What law is illustrated by the repulsive force between the two wires?
What law is illustrated by the repulsive force between the two wires?
A horizontal wire can be levitated against gravity if the current flows in which direction?
A horizontal wire can be levitated against gravity if the current flows in which direction?
What is the direction of the magnetic force on a wire in a magnetic field?
What is the direction of the magnetic force on a wire in a magnetic field?
Why does a current to the east result in an upward force on the power line?
Why does a current to the east result in an upward force on the power line?
What is the equation used to calculate the magnitude of the magnetic force on a wire?
What is the equation used to calculate the magnitude of the magnetic force on a wire?
What is the typical current carried by a DC power line near the equator?
What is the typical current carried by a DC power line near the equator?
What is the mass of the heavy cable in the example?
What is the mass of the heavy cable in the example?
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