Lenz's Law: A circular coil lies flat on a horizontal surface. A bar magnet is held fixed above the center of the coil with its north pole pointing downward. What is the direction of the induced current in the coil, as viewed from above?
A. clockwise
B. counterclockwise
C. There is no current in the coil.
Answer: C
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A Geiger counter is like an electroscope that discharges whenever ions formed by a radioactive particle produce a conducting path. A typical Geiger counter consists of a thin conducting wire of radius 0.002 cm stretched along the axis of a conducting cylinder of radius 2.0 cm. The wire and the cylinder carry equal and opposites charges of 8.0 × 10?10 C all along their length of 10.0 cm. What is the magnitude of the electric field at the surface of the wire?
What will be an ideal response?
Potential Energy: A +3.0-µC point charge is initially extremely far from a positive point charge Q. You find that it takes 41 J of work to bring the +3.0-µC charge to the point x = 3.0 mm, y = 0.0 mm and the point charge Q to the point x = -3.0 mm, y = 0.00 mm. What is Q? (k = …)
A. 55 nC B. 9.1 µC C. 4.6 µC D. 27 pC
An object attached to a spring undergoes SHM. When the object is at its maximum distance from the equilibrium position, which of the following statements are true? (There could be more than one correct choice.)
A) The object's acceleration is zero. B) The object's speed is zero. C) The elastic potential energy of the system object-spring is zero. D) The kinetic energy of the system object-spring is a maximum. E) The total mechanical energy of the system object-spring is zero.
Dry air at 20ºC, 101 kPa, passes through a 2-cm diameter tube at 5 m/s. If the tube is also at 20ºC and has acetone on its inside surface area, estimate the evaporation rate of acetone into air per unit area. Assume the density of saturated vapor acetone is 2.37 g/m^3.
What will be an ideal response?