SPEAR, a storage ring about 72.0 m in diameter at the Stanford Linear Accelerator (closed in 2009), has a 20.0-A circulating beam of electrons that are moving at nearly the speed of light . (See Figure 20.39.) How many electrons are in the beam? Figure 20.39 Electrons circulating in the storage ring called SPEAR constitute a 20.0-A current. Because they travel close to the speed of light, each electron completes many orbits in each second.
SPEAR, a storage ring about 72.0 m in diameter at the Stanford Linear Accelerator (closed in 2009), has a 20.0-A circulating beam of electrons that are moving at nearly the speed of light . (See Figure 20.39.) How many electrons are in the beam? Figure 20.39 Electrons circulating in the storage ring called SPEAR constitute a 20.0-A current. Because they travel close to the speed of light, each electron completes many orbits in each second.
SPEAR, a storage ring about 72.0 m in diameter at the Stanford Linear Accelerator (closed in 2009), has a 20.0-A circulating beam of electrons that are moving at nearly the speed of light. (See Figure 20.39.) How many electrons are in the beam?
Figure 20.39 Electrons circulating in the storage ring called SPEAR constitute a 20.0-A current. Because they travel close to the speed of light, each electron completes many orbits in each second.
Definition Definition Rate at which light travels, measured in a vacuum. The speed of light is a universal physical constant used in many areas of physics, most commonly denoted by the letter c . The value of the speed of light c = 299,792,458 m/s, but for most of the calculations, the value of the speed of light is approximated as c = 3 x 10 8 m/s.
Current describes the rate of electricity (how fast charges are moving). Its formula is I=q/t. The higher the current, the more charges are flowing per unit time. When charging smartphones using a standard USB port, only between 0.5 to 1.5 amps of current can be delivered. Dedicated chargers or superchargers can deliver higher currents, around 2.0 amps or more.
Using a supercharger that can deliver 2.0 amps, how much charge is delivered in 1 hour to a smartphone? Select: (7200C, 1800C, 3600C, or 120C)
How many electrons is this? Select: (about 4.5E22 electrons, about 1.1E22 electrons, about 2.2E22 electrons, or about 9.9E22 electrons)
If the supercharger has a voltage of 5V, what is the equivalent resistance of the smartphone? Select: (5 ohm, 10 ohm, 2.5 ohm, or 0.25 ohm)
How much power (in Joules) was dissipated by the supercharger? Select: (5 Watts, 10 Watts, 20 Watts, or 25 Watts)
What is this power in horsepower? Select: (0.0134 hp, 0.0537 hp, 0.0268 hp, or 0.0067 hp)
How much…
SPEAR, a storage ring about 72.0 m in diameter at the Stanford Linear Accelerator (closed in 2009), has a 20.0-A circulating beam of electrons that are moving at nearly the speed of light. (See Figure.) How many electrons are in the beam?
Electrons circulating in the storage ring called SPEAR constitute a 20.0-A current. Because they travel close to the speed of light, each electron completes many orbits in each second.
A positive charge moves near a very long wire carrying a current as shown. If the 3.9 C charge moves at 9×105 m/s and is 11 cm away from the 3 A current in the long wire, what is the magnitude of the force on the charge? (in N)
a. 1.91×101
b. 6.01×101
c. 1.05×107
d. 5.40×10-1
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