The two wires shown in Figure P19.38 carry currents of 5.00 A in opposite direct

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--- to the left downward to the right out of the page upward into the page
(b) at point P1, 10.0 cm to the right of the wire on the right
T   ---Select--- upward out of the page into the page to the left to the right downward
(c) at point P2, 20.0 cm to the left of the wire on the left
T

Explanation / Answer

Part A)

Midway between the wires, the B fields will be exactly the same, and add, so

B = 2uI/2pr

B = 2(4pi X 10-7)(5)/(2pi)(.05)

B = 4 X 10-5 T - Out of the page

Part B)

The B fields will subtract here, so.

B = (4pi X 10-7)(5)/(2pi)(.1) - (4pi X 10-7)(5)/(2pi)(.2)

B = 5 X 10-6 T out of the page

Part C)

B = (4pi X 10-7)(5)/(2pi)(.2) - (4pi X 10-7)(5)/(2pi)(.3)

B = 1.67 X 10-5 T into the page

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