Protons in an accelerator are moving at 4 x 10° and produce a beam current of 1 μA. If the radius of the 1.8 mm, find: a) the current density: b) the density of particles: particles m³
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- Flying Circus of Physics Kiting during a storm. The legend that Benjamin Franklin flew a kite as a storm approached is only a legend – he was neither stupid nor suicidal. Suppose a kite string of radius 2.07 mm extends directly upward by 0.809 km and is coated with a 0.514 mm layer of water having resistivity 177 Q-m. If the potential difference between the two ends of the string is 190 MV, what is the current through the water layer? The danger is not this current but the chance that the string draws a lightning strike, which can have a current as large as 500 000 A (way beyond just being lethal). Number i UnitsA 1.0 mm diameter Nichrome wire carries a 3.9 mA current. What does the electric field strength need to be to create this current (in V/m)?Energetic particles, such as protons, can be detected with a silicon detector. When a particle strikes a thin piece of silicon, it creates a large number of free electrons by ionizing silicon atoms. The electrons flow to an electrode on the surface of the detector, and this current is then amplified and detected. In one experiment, each incident proton creates, on average, 34,000 electrons; the electron current is amplified by a factor of 100; and the experimenters record an amplified current of 3.5 μA. How many protons are striking the detector per second?
- You are given 1.0 [g] of aluminum (mass density = 2700 kg/m3) and asked to make a wire, using all the aluminum, that will dissipate 7.5 [W] when connected to a 1.5 [V] battery. What length and diameter will you choose for your wire?A beam of 16 MeV deuterons from a cyclotron strikes a copper block.The beam is equivalent to current of 15 mA. (a) At what rate do deuterons strike the block? (b) At what rate is thermal energy produced in the block?The potential difference between points in a wire 75.0 cm apart is 0.938 V when the current density Is 4.40 x 107 A/m2. What is a) the magnitude of Electric field E in the wire? b) the resistivity of the material of which the wire made.