The magnetic field strength inside a current-carrying coil will be greater if the coil encloses
A) a vacuum.
B) a wooden rod.
C) a glass rod.
D) an iron rod.
E) none of the above
Answer: D
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If a nucleus decays by alpha decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)
A) The daughter nucleus has more neutrons than the original nucleus. B) The daughter nucleus has more protons than the original nucleus. C) The daughter nucleus has fewer protons than the original nucleus. D) The daughter nucleus has the same number of nucleons as the original nucleus. E) The daughter nucleus has fewer neutrons than the original nucleus.
Mary builds a simple magnifying telescope using two lenses of focal length 80. cm and 5.0 cm. The respective diameters are 60. mm and 10. mm
How many degrees wide does the moon appear through the telescope if it appears only 1/2 degree wide with the "naked eye"?
Identical point charges (+30 ?C) are placed at the corners of a rectangle (4.0 m × 6.0 m). How much external energy is required to bring a charge of 55 ?C from infinity to the midpoint of one of the 6.0-m long sides of the rectangle?
a. 22 J b. 16 J c. 13 J d. 19 J e. 8.0 J
A 120-V rms voltage at 1000 Hz is applied to a resistor and an inductor in series. If the impedance of this circuit is 110 ?, what is the maximum value of the current?
A) 1.54 A B) 1.09 A C) 1.84 A D) 1.04 A E) None of the other answers is correct.