Some superconductors are capable of carrying a very large quantity of current. If the measured current is 3.00 × 10^6 A, how many electrons are moving through the superconductor per second? (e = 1.60 × 10^?19 C)
a. 1.88
b. 4.6E+15
c. 7.1E+19
d. 2.9E+23
a
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The equivalent resistance of any parallel branch in a circuit is
A) often less than the resistance of the lowest resistor. B) always less than the resistance of the lowest resistor. C) usually half the value of the lowest resistor. D) none of the above
If the diameter of a radar dish is doubled, what happens to its resolving power assuming that all other factors remain unchanged?
A) The resolving power quadruples. B) The resolving power doubles. C) The resolving power is cut in half. D) The resolving power is reduced to one-quarter its original value.
In a mass spectrometer, a single-charged particle (charge e) has a speed of 1.0 × 106 m/s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit is 0.020 m. What is the mass of the particle?
A) 3.2 × 10-28 kg B) 6.4 × 10-28 kg C) 1.7 × 10-27 kg D) 4.5 × 10-27 kg E) 3.1 × 10-31 kg
Before the switch is closed in the figure, the potential across the capacitor is 200 V. At some instant after the switch is closed, the instantaneous current is 0.70 A. What is the energy in the capacitor at this instant?
a.
49 mJ
b.
31 mJ
c.
80 mJ
d.
0.13 J
e.
62 mJ