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Questions and Answers
In which section of the copper wire is the electric field the greatest?
In which section of the copper wire is the electric field the greatest?
- Section with the smallest radius (correct)
- Section with no radius variation
- Section with the largest radius
- Section with the middle radius
Where is the electric field the weakest along the copper wire?
Where is the electric field the weakest along the copper wire?
- Section with the smallest radius
- Section with the middle radius
- Section with the largest radius (correct)
- Section with no radius variation
In which section of the copper wire is the current density the greatest?
In which section of the copper wire is the current density the greatest?
- Section with the middle radius
- Section with the largest radius (correct)
- Section with the smallest radius
- Section with no radius variation
Where is the current density the weakest along the copper wire?
Where is the current density the weakest along the copper wire?
Which section of the copper wire has the greatest electric field?
Which section of the copper wire has the greatest electric field?
Rank the sections of the copper wire according to the magnitude of the electric field, greatest first.
Rank the sections of the copper wire according to the magnitude of the electric field, greatest first.
In which section of the copper wire is the current density the greatest?
In which section of the copper wire is the current density the greatest?
Rank the sections of the copper wire according to the magnitude of the current density, greatest first.
Rank the sections of the copper wire according to the magnitude of the current density, greatest first.
In an electric circuit, what is the purpose of a fuse?
In an electric circuit, what is the purpose of a fuse?
At what current density does the material used in a fuse melt?
At what current density does the material used in a fuse melt?
What happens to the fuse when the current exceeds the predetermined value?
What happens to the fuse when the current exceeds the predetermined value?
What diameter of cylindrical wire should be used to make a fuse that will limit the current to 0.50 A?
What diameter of cylindrical wire should be used to make a fuse that will limit the current to 0.50 A?
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Study Notes
Electric Field and Current Density in Copper Wire
- The electric field is the greatest near the ends of the copper wire and weakest at the center.
- The current density is the greatest near the surface of the copper wire and weakest at the center.
Fuse in an Electric Circuit
- A fuse is used to protect an electric circuit from excessive current by melting and breaking the circuit when the current exceeds a predetermined value.
- The material used in a fuse melts at a specific current density.
- When the current exceeds the predetermined value, the fuse melts, breaking the circuit.
- To limit the current to 0.50 A, a cylindrical wire with a specific diameter should be used to make a fuse.
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