A constant magnetic field can be used to produce an electric current
Indicate whether the statement is true or false
TRUE
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Why are Saturn's rings so thin?
A) The "gap" moons shepherd the particles and maintain its thin profile. B) Any particle in the ring with an orbital tilt would collide with other ring particles, flattening its orbit. C) The current thinness is a short-lived phenomenon that is special to this time. D) Saturn's gravity prevents particles from migrating upwards out of the rings. E) Solar radiation pressure keeps particles pressed into the rings.
One mole of hydrogen, one mole of nitrogen and one mole of oxygen are held in a 22.4 × 10^3 cm3 enclosed vessel at 20°C. The pressure in the vessel, in N/m2, is
a. 109. b. 304. c. 326. d. 1.09 × 10^5. e. 3.26 × 10^5.
Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds.What is the work done by the force?
a. 150 J b. 50 J c. 75 J d. undetermined—not enough information given e. none of the above
Bert says that a charged particle in a vacuum can travel in a helix only if a uniform electric field and a uniform magnetic field are both present and both parallel to the axis of the helix. Stuart says that only a magnetic field with a component parallel to the axis of the helix is needed. Which one, if either, is correct, and why?
a. Bert, because the charged particle's velocity can have a vertical component only if an electric field in the vertical direction is present. b. Stuart, because a component of velocity in the vertical direction is not changed by a vertical component of a magnetic field. c. Bert, because a component of velocity in the vertical direction is changed by a vertical component of a magnetic field. d. Stuart, because an electric field in the vertical direction would cause the particle to come to a complete stop. e. Neither, because particles cannot move in helical paths in the presence of magnetic and electric fields.