18 Questions
What is the primary purpose of a set of jumper cables?
To start a car with a dead battery
What is the direction of the force on the black wire due to the current in the red wire?
In the opposite direction of the current in the red wire
To find the force on the red wire, what two-step process is used?
Find the magnetic field due to the current in the black wire, then find the force on the current in 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?
Because of Newton's Third Law
What is the effect of increasing the separation distance between the wires on the force between them?
The force decreases
What is the current in each wire of the jumper cables?
150 A
What is the direction of the magnetic field at the position of the red wire due to the current in the black wire?
Into the page
What is the direction of the force on the red wire?
Away from the black wire
Why are the forces between currents not an important consideration in most cases?
Because they are typically very small
What is the significance of the direction of the currents in the two wires?
It determines the type of force (repulsive or attractive)
What is an example of a situation where the forces between currents are important?
An MRI solenoid
What law is illustrated by the repulsive force between the two wires?
Newton's Third Law
A horizontal wire can be levitated against gravity if the current flows in which direction?
Right to left
What is the direction of the magnetic force on a wire in a magnetic field?
Perpendicular to the wire and the magnetic field
Why does a current to the east result in an upward force on the power line?
Because the current is perpendicular to the magnetic field
What is the equation used to calculate the magnitude of the magnetic force on a wire?
F = ILB sin θ
What is the typical current carried by a DC power line near the equator?
850 A
What is the mass of the heavy cable in the example?
1000 kg
Find the force between two wires in a set of jumper cables connected to a running vehicle to start a car with a dead battery. Learn about the physics behind jumper cables.
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