A long wire carries a current of 3.0 A along the axis of a long solenoid (radius = 3.0 cm, n = 900 turns/m, current = 30 mA). What is the magnitude of the magnetic field at a point 2.0 cm from the axis of the solenoid? Neglect any end effects
a. 34 ?T
b. 64 ?T
c. 30 ?T
d. 45 ?T
e. 4.0 ?T
d
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Compare the speed of spiral density waves with the orbital speeds of stars in the visible part of the Galactic disk
What will be an ideal response?
A 1.40-cm-tall object is placed along the principal axis of a thin convex lens of 13.0 cm focal length. If the object distance is 19.2 cm, which of the following best describes the image distance and height, respectively?
a. 7.75 cm and 4.34 cm b. 40.3 cm and 2.94 cm c. 7.75 cm and 7.27 cm d. 9.16 cm and 4.34 cm e. 41.4 cm and 0.668 cm
A nonchemical combination of two or more substances in variable proportions is called
a. a mixture. b. a compound. c. an ion. d. a molecule.
A fish looks up through the smooth surface of the water at a bear directly above it. To the fish,
A. the bear appears to be exactly where it really is. B. the bear appears to be further away than it really is. C. the bear appears to be closer to the point directly above the fish than it really is. D. the bear cannot be seen due to total internal reflection.