Four identical 2.5-mF capacitors are connected together electrically. What is the greatest possible capacitance of the combination?
a. 0.50 mF
b. 0.42 mF
c. 0.63 mF
d. 10 mF
e. 0.40 mF
d
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An eagle, with a wingspread of 2.0 m, flies toward the north at 8.0 m/s in a region where the vertical component of the earth's magnetic field is 0.20 × 10-4 T
What emf would be developed between the eagle's wing tips? (It has been speculated that this phenomenon could play a role in the navigation of birds, but the effect is too small, in all likelihood.)
A charge of uniform density (0.80 nC/m) is distributed along the x axis from the origin to the point x = 10 cm. What is the electric potential (relative to zero at infinity) at a point, x = 18 cm, on the x axis?
a. 7.1 V b. 5.8 V c. 9.0 V d. 13 V e. 16 V
The two strongest forces that act between protons in a nucleus are
A) the weak nuclear and electromagnetic forces. B) the weak nuclear and the gravitational forces. C) the electrostatic and the gravitational forces. D) the strong nuclear and the electrostatic forces.
A star of apparent magnitude 6 appears ________ times brighter than a star of apparent magnitude 7.
A. 1.00 B. 0.5 C. 13.0 D. 2.51 E. 10.0