An electron moving in the direction of the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, the direction of the magnetic field in this region points in the direction of the
A) +z-axis.
B) -z-axis.
C) -x-axis.
D) +y-axis.
E) -y-axis.
Answer: B
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A solenoid of length 18 cm consists of closely spaced coils of wire wrapped tightly around a wooden core. The magnetic field strength is 2.0 mT inside the solenoid near its center when a certain current flows through the coils
If the coils of the solenoid are now pulled apart slightly, stretching it to 21 cm without appreciably changing the size of the coils, what does the magnetic field become near the center of the solenoid when the same current flows through the coils? (?0 = 4? × 10-7 T • m/A) A) 1.7 mT B) 3.4 mT C) 0.85 mT D) 2.0 mT
A flask half filled with water is on a weighing scale. If you float a piece of wood in it, the scale reading will be
A) less. B) the same. C) greater.
The Sun is a slightly variable star. What if the surface temperature of the Sun were to increase from 6 000 K to 6 100 K, what would be the increase in total power radiated assuming no other changes such as radius or emissivity?
a. 1.6% b. 6.8% c. 3.4% d. 14%
A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the total energy of the system is
a. 2.0 × 10^4 J. b. 2.5 × 10^4 J. c. 1.7 × 10^3 J. d. 1.5 × 10^3 J. e. 4.0 × 10^4 J.