A uniform electric field of 1.00 N/C is set up by a uniform distribution of charge in the xy plane. What is the electric field inside a metal ball placed 0.500 m above the xy plane?
1.1.00 N/C
2.21.00 N/C
3.0
4.0.250 N/C
5.varies depending on the position inside the ball
3
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A straight wire carries a current of 40 A in a uniform magnetic field (magnitude = 80 mT). If the force per unit length on this wire is 2.0 N/m, determine the angle between the wire and the magnetic field.
A. either 39° or 141° B. either 25° or 155° C. either 70° or 110° D. either 42° or 138° E. either 65° or 115°
A light beam is incident upon a still water surface. What is the maximum possible value for the angle of refraction? (nwater = 1.333)
a. 76.2° b. 67.5° c. 54.4° d. 48.6°
As I use sandpaper on some rusty metal, the sandpaper gets hot because:
a. heat is flowing from the sandpaper into the metal. b. heat is flowing from the metal into the sandpaper. c. frictional processes increase the internal energy of the sandpaper. d. heat is flowing from my hand into the sandpaper.
How long is a wire made from 100 cm3 of copper if its resistance is 4.0 ohms? The resistivity of copper is 1.7 × 10^–5 ?·m
a. 4.9 m b. 1.7 × 10^2 m c. 2.6 × 10^2 m d. 1.5 × 10^3 m e. 24 m