Problem 7: A power line carries a DC current of 1= 29 A in a direction φ-29° east of magnetic north through an open field. in a location where the Earth's magnetic field is horizontal and its strength is B-0.39 G A Part (a) Calculate the magnitude of the magnetic force per unit length, F/I, in newtons per meter, exerted on the wire due to the Earth's magnetic field. Part (b) In what direction does the force on the wire act? Up V Correct! Part (c) You decide to re-orient the wire to minimize the magnetic force acting on the wire. In what direction(s) could the current flow? OUp East ONorth West OThe magnetic force does not depend on the orientation of the wire. OThe wire should be oriented in a direction not listed ODown OSouth Submit Hint Feedback I give up! Hints: 1% deduction per hint. Hints remaining: 1 Feedback: 1% deduction per feedback. Part (d) In what direction(s) could you orient the current flow to maximize the magnetic force acting on the wire? Part (e)_In which of the directions that correctly answer part (d) is the magnetic force on the wire up? East Correct! Part (f) If the wire is oriented so that the current flows in the direction you chose for part (e), what would the mass per unit length of the wire, u, in grams per meter, need to be for the magnetic force to balance the weight of the wire?
Problem 7: A power line carries a DC current of 1= 29 A in a direction φ-29° east of magnetic north through an open field. in a location where the Earth's magnetic field is horizontal and its strength is B-0.39 G A Part (a) Calculate the magnitude of the magnetic force per unit length, F/I, in newtons per meter, exerted on the wire due to the Earth's magnetic field. Part (b) In what direction does the force on the wire act? Up V Correct! Part (c) You decide to re-orient the wire to minimize the magnetic force acting on the wire. In what direction(s) could the current flow? OUp East ONorth West OThe magnetic force does not depend on the orientation of the wire. OThe wire should be oriented in a direction not listed ODown OSouth Submit Hint Feedback I give up! Hints: 1% deduction per hint. Hints remaining: 1 Feedback: 1% deduction per feedback. Part (d) In what direction(s) could you orient the current flow to maximize the magnetic force acting on the wire? Part (e)_In which of the directions that correctly answer part (d) is the magnetic force on the wire up? East Correct! Part (f) If the wire is oriented so that the current flows in the direction you chose for part (e), what would the mass per unit length of the wire, u, in grams per meter, need to be for the magnetic force to balance the weight of the wire?
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:Problem 7:
A power line carries a DC current of 1= 29 A in a direction φ-29° east of magnetic north through an open field.
in a location where the Earth's magnetic field is horizontal and its strength is B-0.39 G
A Part (a) Calculate the magnitude of the magnetic force per unit length, F/I, in
newtons per meter, exerted on the wire due to the Earth's magnetic field.
Part (b) In what direction does the force on the wire act?
Up V Correct!
Part (c) You decide to re-orient the wire to minimize the magnetic force acting on the
wire. In what direction(s) could the current flow?
OUp
East
ONorth
West
OThe magnetic force does not depend on the orientation of
the wire.
OThe wire should be oriented in a direction not listed
ODown
OSouth
Submit
Hint
Feedback
I give up!
Hints: 1% deduction per hint. Hints remaining: 1
Feedback: 1% deduction per feedback.
Part (d) In what direction(s) could you orient the current flow to maximize the
magnetic force acting on the wire?
Part (e)_In which of the directions that correctly answer part (d) is the magnetic force
on the wire up?
East
Correct!
Part (f) If the wire is oriented so that the current flows in the direction you chose for
part (e), what would the mass per unit length of the wire, u, in grams per meter, need to be for
the
magnetic force to balance the weight of the wire?
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