1. (2 pt) A complete circuit is built with two vertical posts, a shielded wire connecting...

 

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1. (2 pt) A complete circuit is built with two vertical posts, a shielded wire connecting the two on the bottom and a wire that is free to slide up and down the posts above it, and a current source (see the figure below). The horizontal wires have length 0.1m. The sliding wire has mass 0.001kg. What current would be needed to keep the sliding wire suspended 1cm above the bottom wire? 2. (2 pt) A long wire carrying a current of 1A is very close to a second long wire carrying a current of 1A in the reverse direction. What is the approximate magnitude of the magnetic field due to this arrangement far enough away from the wires that the distance between them can be neglected? Provide one argument based on Ampere's Law and one based on the definition of current. 1. (2 pt) A complete circuit is built with two vertical posts, a shielded wire connecting the two on the bottom and a wire that is free to slide up and down the posts above it, and a current source (see the figure below). The horizontal wires have length 0.1m. The sliding wire has mass 0.001kg. What current would be needed to keep the sliding wire suspended 1cm above the bottom wire? 2. (2 pt) A long wire carrying a current of 1A is very close to a second long wire carrying a current of 1A in the reverse direction. What is the approximate magnitude of the magnetic field due to this arrangement far enough away from the wires that the distance between them can be neglected? Provide one argument based on Ampere's Law and one based on the definition of current.