A long solenoid (1000 turns/m) carries a current of 25 mA and has an inside radius of 2.0 cm. A long wire which is parallel to and 4.0 cm from the axis of the solenoid carries a current of 6.0 A. What is the magnitude of the magnetic field at a point on the axis of the solenoid?
a. 51 ?T
b. 61 ?T
c. 43 ?T
d. 81 ?T
e. 1.4 ?T
c
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An object is placed between C and F in front of a concave mirror with a focal length of 10 cm. What is the position of its image in relation to the mirror and what are its characteristics?
A) = 10 cm, real, smaller than object B) = 10 cm, virtual, smaller than object C) > 20 cm, real, larger than object D) = 20 cm, real, same size as the object E) = 20 cm, virtual, same size as the object
Total lunar eclipses always occur
a. at the time of new moon. b. at the time of full moon. c. during either equinox. d. during either solstice. e. at the time that the sun is directly overhead.
The decay constant of radon is 0.181 day s-1. A sample of radon contains 6.00 × 108 radon atoms. How many atoms are left after 10.0 days?
A) 9.82 × 107 B) 7.67 × 107 C) 8.34 × 108 D) 7.29 × 108 E) 8.56 × 108
When counting particle-in-a-box quantum states in three dimensions, why do we divide the “volume” of only one eighth of a full spherical shell by the “volume” per quantum state? Why not the full shell’s volume?
A. Molecules in a gas can only have positive momentum components. B. A single quantum energy state embraces both positive and negative values for each momentum component. C. A particle’s momentum magnitude must be positive. D. The factor of 2 in the expression h/2L already counts both possible momentum signs. E. We really do include the full shell: the diagram only shows 1/8 of the shell to make it easier to draw. F. Some other reason (specify).