Magnetic Field of a Long Wire: A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current
A. points directly away from you.
B. points to the left.
C. circles the wire in a clockwise direction.
D. circles the wire in a counter-clockwise direction.
Answer: D
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The EEF shown is incorrectly drawn because
A. It curves toward the axis in a forbidden region or away from the axis in an allowed region.
B. Its wavy part doesn’t have the right number of bumps.
C. The amplitude of the wavy part varies incorrectly.
D. The wavelength of the wavy part varies incorrectly.
E. One of the exponential-like tails has the wrong length.
In tropical areas of the world where refrigeration is not readily available, people store water in unglazed clay pots. This makes the water stay at a cool temperature, much cooler than the ambient temperature. How is that possible?
What will be an ideal response?
Two spheres are made of conducting material. Sphere #2 has twice the radius of Sphere #1 . What is the ratio of the capacitance of Sphere #2 to the capacitance of sphere #1?
a. 1, since all conducting spheres have the same capacitance. b. 2 c. 4 d. 8 e. A single sphere has no capacitance since a second concentric spherical shell is necessary to make a spherical capacitor. Thus, none of the answers above is correct.
The rotational inertia of your leg is greater when your leg is
A) straight. B) bent. C) same either way