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Homework help -- magnetic field from a wire causing compass deflection....
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[QUOTE="berkeman, post: 5439929, member: 8921"] Welcome to the PF. It will help you to make a drawing of the setup. Have the wire coming out of the page toward you, with the current coming up at you. So the B-field circulates counter-clockwise around the wire, right? (by the Right Hand Rule). Draw a vertical axis and a horizontal axis on your figure -- the vertical axis points up toward north, and the horizontal axis points to the right towards the east. The wire is coming up at you from the origin of those x-y axes. Draw where the compass is. When there is no current in the wire, you are given what the Earth's B-field is, and it makes the compass point due north (at least in this simple problem). When the current is switched on, the B-fields from the Earth and from the wire add up vectorially, giving a new resultant B-field vector at the compass. This causes the compass needle to deflect one way or the other. Your task is to add up those two B-fields to see what how much the resultant B-field vector rotates compared to true north. Have at it! :smile: [/QUOTE]
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Homework help -- magnetic field from a wire causing compass deflection....
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