Answer the following statement(s) true (T) or false (F)
1. The current flow in the wire is constant in time.
2. The current is the same for any cross-sectional area spanning the wire at any point along the wire.
3. The electric field inside the wire is zero.
4. The net charge density in the wire’s interior is zero.
5. Excess charges may be found on the wire’s surface.
1. TRUE
2. TRUE
3. FALSE
4. TRUE
5. TRUE
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An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 107 m/s. What is the radius of the circle? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A) 1.5 mm B) 0.22 mm C) 2.2 mm D) 0.39 mm E) 3.9 mm
You are asked to select a material for a barge tow line that must be as strong as steel cable, but can float on water and is not corroded by salt water. What material discussed in this chapter might be suitable?
What will be an ideal response?
The greatest diffraction occurs for
a. ? < d. b. ? = d. c. ? > d. d. none of these; that is, it makes no difference.
A spherical interplanetary grain of dust of radius 0.2 mm is at a distance r1 from the Sun. The gravitational force exerted by the Sun on the grain just balances the force due to radiation pressure from the Sun’s light. Assume the grain is moved to a distance 2r1 from the Sun and released. At this location, what is the net force exerted on the grain?
1.toward the Sun 2.away from the Sun 3.zero 4.impossible to determine without knowing the mass of the grain