A squat refrigerator magnet sits on a table with its north pole facing up and its south pole down. We push a ring of wire lying on the table directly toward the magnet. What direction does current flow in the ring when viewed from above? (A wooden table will not affect the magnet’s field.)
A. Clockwise
B. Counterclockwise
C. No current flows in the loop.
B. Counterclockwise
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The saros cycle
a. was used in ancient times to predict eclipses. b. is 18 years, 11 1/3 days long. c. comes from a Greek word that means repetition. d. all of the above e. none of the above
The center of the Milky Way lies in the direction of the constellation Cygnus
Indicate whether the statement is true or false
The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0.724 W/m2. What is the maximum value of the magnetic field in the wave?
(c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2) A) 77.9 nT B) 55.1 nT C) 38.9 nT D) 108 nT E) 156 nT
A pilot drops a bomb from a plane flying horizontally at a constant speed. Neglecting air resistance, when the bomb hits the ground the horizontal location of the plane will
A) be behind the bomb. B) be over the bomb. C) be in front of the bomb. D) depend of the speed of the plane when the bomb was released. E) depend of the mass of the bomb when it was released.