How much current must pass through a 400 turn coil 4.0 cm long to generate a 1.0-T magnetic field at the center?
A) 0.013 A
B) 13 A
C) 22 A
D) 40 A
E) 80 A
E
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If a star is located at 10 pc, which of the following statements is correct?
a. The star's apparent and absolute visual magnitudes are equal. b. The star's apparent and absolute visual magnitudes are 0. c. The star's apparent visual magnitude is –-1.1 whereas the absolute visual magnitude is –5 d. Two of the other choices are correct.
How do mass-to-light ratios for the inner regions of galaxies compare to the mass-to-light ratios we find when we look farther from a galaxy's center? What does this tell us about dark matter in galaxies?
What will be an ideal response?
What is the relativistic kinetic energy of an electron moving at a speed of 2.30 × 10^8 m/s? (electron mass is 9.11 × 10^?31 kg and c = 3.00 × 10^8 m/s)
a. 4.57E–14 J b. 1.28E–13 J c. 5.26E–14 J d. 3.38E–14 J e. 8.20E–14 J