Physics 21 Fall 2007 Solution to HW-13 Magnetic Field due to a Wire Find the direction of the magnetic field at each of the indicated points. What is the direction of the magnetic field at points A, B, C, D , and E ? I I 2 I (A) At point A , the field is OUT OF THE PAGE, by the right hand rule. (B) At point B , the field is INTO THE PAGE, by the right hand rule. (C) Here we must add the fields produced by both wires. For point C , both fields are in the same direction, OUT OF THE PAGE. (D) Point D is equidistant from both wires, so both fields are proportional just to the current. The field from wire 1 is into the page, but the stronger field (since the current is greater) from wire 2 is out of the page. The total B is OUT OF THE PAGE. (E) Here we again add the fields produced by both wires. For point E, both fields are in the same direction, INTO THE PAGE. 28-9 A straight wire caries a 10.0 amp current ABCD is a rectangle with point D in the middle of a 1.10 mm segment of the
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