A spherical conductor (radius = 1.0 cm) with a charge of 2.0 pC is within a concentric hollow spherical conductor (inner radius = 3.0 cm, outer radius = 4.0 cm) which has a total charge of ?3.0 pC. What is the magnitude of the electric field 2.0 cm from the center of these conductors?
a. 23 N/C
b. zero
c. 45 N/C
d. 90 N/C
e. 110 N/C
c
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Which of the following is true about Bragg planes?
A positively charged particle has a velocity in the negative z direction at point P. The magnetic force on the particle at this point is in the negative y direction. Which one of the following statements about the magnetic field at point P can be determined from this data?
A. Bx is positive. B. Bz is positive. C. By is negative. D. By is positive. E. Bx is negative.
For the ion He+, what is the energy of the ground state?
A. -13.6 eV B. -27.2 eV C. -54.4 eV D. -6.80 eV E. -3.40 eV
Answer the following statement(s) true (T) or false (F)
1. Two blinking warning lights are 3000 m apart along a railroad track. Suppose that in the ground frame the west light blinks (event W ) 5 ?s before the east light blinks (event E). Now imagine that both lights are observed by a passenger on the train who passes the west light just as it blinks. It is possible for the train to be moving fast enough that the two blinks are observed (not necessarily seen) by the passenger to be simultaneous
2. Suppose an explosion occurs at x = 0 in the Home Frame (event A). Light from the explosion is detected by a detector at position x = –100 ns (event B) and by a detector at position x = +50 ns (event C). Events B and C are causally connected
3. If the space time interval between two events is time like, then the temporal order of the two events is the same in every inertial reference frame.
4. If the space time interval between two events A and B is spacelike and event A occurs before event B in some Home Frame, then it is always possible to find an Other Frame where the events occur in the other order
5. An unidentified spaceship cruises past Outpost 11, a space station floating in deep space, at a speed of 
, without acknowledging requests for identification. Ten seconds after the ship passes (according to Outpost 11 clocks), Outpost 11 sends a message to the departing ship, warning that it will commence firing if the ship does not respond. Fifteen seconds after that, Outpost 11 sensors indicate that the ship has raised its shields. This is clearly a response to the warning