The graphs below represent current and voltage phasors at one instant of time. The solid arrows represent the voltage phasors, ?Vmax, and the dashed arrows represent the current phasors, Imax. Which graph shows the correct relationship between current and voltage phasors for a capacitor in an RC circuit?
a.
b.
c.
c
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A new polymer is developed, and to characterize the electrical properties of the polymer, the capacitance is determined to be 20.36×10-13 F in a parallel-plate capacitor that has square plates with a side length of 10-2 m, and the thickness of the polymer sheet and the spacing between the plates is 10-3 m.
(a) What is the dielectric constant or relative permittivity of this new material? (b) If the capacitance measurement is made with an applied voltage of 10 volts, what is the magnitude of the polarization in the new polymer?
Thermodynamic Devices: An ideal reversible heat pump is taking heat from the outside air at -10.0°C and discharging it into the house at 18.0°C. What is the coefficient of performance of this heat pump?
A. 10.4 B. 9.44 C. 0.644 D. 0.533 E. 0.0962
A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second? (h = 6.626 × 10-34 J • s, c = 3.00 × 108 m/s)
A) 6.7 × 1015 B) 8.8 × 1015 C) 1.1 × 1016 D) 1.3 × 1016
A battery charges a parallel-plate capacitor fully and then is removed. The plates are then slowly pulled apart. What happens to the potential difference between the plates as they are being separated?
A) It increases. B) It decreases. C) It remains constant. D) It cannot be determined from the information given.