A 1 000-V battery, a 3 000-? resistor, and a 0.50-µF capacitor are connected in series with a switch. The capacitor is initially uncharged. What is the value of the current the moment after the switch is closed?
a.
0.39 A
b.
0.33 A
c.
0.84 A
d.
2 000 A
b
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The magnetic field at a point P, a certain distance from a long wire carrying a current of 2.0 A, is 1.2 × 10-6 T. How far is P from the center of the wire?
A) 11 cm B) 22 cm C) 33 cm D) 44 cm E) 55 cm
A proton and an electron each have the same de Broglie wavelength. (i) Which has the lower speed, and (ii) which has the lower kinetic energy?
a. (i) the electron, (ii) the electron b. (i) the electron, (ii) Either one can have the greater kinetic energy. c. (i) the proton, (ii) Either one can have the greater kinetic energy. d. (i) the proton, (ii) the proton
An Earthquake occurs as
A) seismic waves travel to Earth's surface. B) energy released from Earth's interior travels to Earth's surface. C) energy released at Earth's surface travels to Earth's interior. D) seismic waves travel to Earth's interior. E) energy released from Earth's interior travels in the form of seismic waves to Earth's surface.
If light travels 63,000 AU in 1 year at 3 × 10^8 m/s, which of these best represents the unit of a light-year?
a. 63,000 AU b. 3 × 10^8 m/s c. 1 year d. All of the other choices are correct.