A charged particle moves in a region of uniform magnetic field along a helical path (radius = 4.0 cm, pitch = 20 cm, period = 2.0 ms). What is the speed of the particle as it moves along this path?
A. 0.13 km/s
B. 0.10 km/s
C. 0.16 km/s
D. 0.23 km/s
E. 0.06 km/s
Answer: C
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A) 0 m/s2. B) 5 m/s2. C) 10 m/s2. D) infinite. E) none of the above
A parallel plate capacitor with circular plates having radius 0.07 m and a dielectric with constant 2.2. If it is desired to store 
J in this capacitor, what must the separation distance be for a voltage of 1.5 kV?
A. 2.8 cm B. 5.5 cm C. 1.3 cm D. 0.90 cm E. 1.4 cm
In an LC circuit, if we increase the capacitor’s capacitance (while keeping everything else the same), the circuit’s oscillation frequency will
A. increase. B. decrease. C. remain the same. D. One needs more information to answer
Ice crystals in nearly frozen liquid water make up a
A) microscopic slush. B) region of lower density. C) both of these D) neither of these