A transformer is based on a principle of
A) self inductance.
B) direct current.
C) alternating current.
D) mutual inductance.
E) energy conservation.
D
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Consider a series circuit in which the capacitive reactance equals the inductive reactance. What is the phase angle between current and voltage?
A) +180.° B) +90.° C) -180.° D) -90.° E) 0.°
A crystal diffracts a beam of electrons, like a grating, as they hit it perpendicular to its surface
The crystal spacing is 0.18 nm, and the first maximum scattering occurs at 80° relative to the normal to the surface. (e = 1.60 × 10-19 C, melectron = 9.11 × 10-13 kg, h = 6.626 × 10-34 J ? s) (a) What is the wavelength of the electrons? (b) What potential difference accelerated the electrons if they started from rest?
A charge of 25 nC is uniformly distributed along a circular arc (radius = 2.0 m) that is subtended by a 90-degree angle. What is the magnitude of the electric field at the center of the circle along which the arc lies?
a. 81 N/C b. 61 N/C c. 71 N/C d. 51 N/C e. 25 N/C
The United States is one of the least expensive places to build a power facility
What will be an ideal response?