Two long parallel wires carry currents of 10 A in opposite directions. They are separated by 40 cm
What is the magnitude of the magnetic field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (?0 = 4? × 10-7 T ? m/A)
A) 3.3 µT B) 1.5 µT C) 6.7 µT D) 33 µT E) 67 µT
C
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Parallel Wires: Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in the same direction,
A. one wire is lifted slightly while the other wire is forced downward against the table's surface. B. both wires are lifted slightly. C. the wires pull toward each other. D. the wires push away from each other.
A car is traveling counterclockwise along a circular bend in the road whose effective radius is 100 m. At a certain instant of time, the car is traveling due north, has a speed of 10 m/s, and is in the process of increasing that speed at a rate of 1 m/s2. The direction of the car’s acceleration at that instant is most nearly
A. North B. Northeast C. East D. Northwest E. West F. Southwest T. Zero
What is the apparent path of the Sun along the celestial sphere?
a)the ecliptic b)a eclipse c) retrograde motion
Rays that go through the focal point to a concave mirror return:
a. back on themselves. b. parallel to the optic axis. c. perpendicular to the optic axis. d. at many different angles from the mirror surface. e. at many different angles relative to the optic axis.