A point charge of 6.0 nC is placed at the center of a hollow spherical conductor (inner radius = 1.0 cm, outer radius = 2.0 cm) which has a net charge of -4.0 nC. Determine the resulting charge density on the inner surface of the conducting sphere
a. +4.8 mC/m2
b. -4.8 mC/m2
c. -9.5 mC/m2
d. +9.5 mC/m2
e. -8.0 mC/m2
B
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Parallel Wires: When two long parallel wires carry unequal currents, the magnitude of the magnetic force that one wire exerts on the other is F. If the current in both wires is now doubled, what is the magnitude of the new magnetic force on each wire?
A. 16F
B. 8F
C. 4F
D. 2F
E. F
In the reaction 2Al + 3F2? 2AlF3, the aluminum
a. is reduced. b. gains electrons. c. is oxidized. d. is the catalyst.
Free Fall: A test rocket at ground level is fired straight up from rest with a net upward acceleration of 20 m/s2. After 4.0 s, the motor turns off but the rocket continues to coast upward with insignificant air resistance. What maximum elevation does the rocket reach?
A. 160 m B. 330 m C. 320 m D. 410 m E. 490 m
The core of the Sun is
A) at the same temperature and density as the surface. B) at the same temperature but denser than the surface. C) hotter and denser than the surface. D) constantly rising to the surface through convection. E) composed of iron.