The two wires shown in Figure P19.38 carry currents of 5.00 A in opposite direct
ID: 1374490 • Letter: T
Question
The two wires shown in Figure P19.38 carry currents of 5.00 A in opposite directions and are separated by 10.0 cm. Find the direction and magnitude of the net magnetic field at the following locations.
(a) at a point midway between the wires
T ---Select--- out of the page upward to the left to the right downward into the page
(b) at point P1, 10.0 cm to the right of the wire on the right
T ---Select--- upward to the left downward to the right into the page out of the page
(c) at point P2, 20.0 cm to the left of the wire on the left
T ---Select--- to the right to the left downward upward out of the page into the page
Explanation / Answer
Note that for a long wire,
B = uo I / [2 pi r]
where the direction of B is determined by the right hand rule.
The net magnetic field at any point here is the sum of the magnetic fields due to each of the wires.
Thus, midway,
B = 4.00*10^-5 T, INTO THE PAGE [ANSWER, PART A]
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At P1,
B = 5.00*10^-6 T, OUT OF THE PAGE [ANSWER, PART B]
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At P2,
B = 1.67*10^-6 T, OUT OF THE PAGE [ANSWER, PART C]
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