Charge of uniform density (80 nC/m3) is distributed throughout a hollow cylindrical region formed by two coaxial cylindrical surfaces of radii 1.0 mm and 3.0 mm. Determine the magnitude of the electric field at a point which is 2.0 mm from the symmetry axis
a. 7.9 N/C
b. 9.0 N/C
c. 5.9 N/C
d. 6.8 N/C
e. 18 N/C
d
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A solid metal wire has a certain resistance. It is heated and carefully stretched to form a longer, thinner wire. After it cools, the resistance is _______ than it was before
a. greater b. less c. no more d. lighter
A charged particle moves in a region of uniform magnetic field along a helical path (radius = 5.0 cm, pitch = 12 cm, period = 5.0 ms). What is the speed of this particle as it moves along this path?
a. 67 m/s b. 26 m/s c. 63 m/s d. 24 m/s e. 87 m/s
Standing Sound Waves: In a resonating pipe that is open at one end and closed at the other, there
A. are displacement nodes at each end. B. are displacement antinodes at each end. C. is a displacement node at the open end and a displacement antinode at the closed end. D. is a displacement node at the closed end and a displacement antinode at the open end.
An electron inside a hydrogen atom is confined to within a space of 0.110 nm. What is the minimum uncertainty in the electron's velocity? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 3.31 × 106 m/s B) 4.71 × 106 m/s C) 3.30 × 108 m/s D) 4.71 × 108 m/s E) 3.30 × 1010 m/s