A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 12 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the same direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
a. 1.1 mT
b. 1.4 mT
c. 1.7 mT
d. 2.0 mT
e. 0.2 mT
A
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At t = 0 the switch S is closed with the capacitor uncharged. If C = 30 ?F, ? = 30 V, and R = 5.0 k?, at what rate is energy being stored in the capacitor when I = 2.0 mA?
A. 32 mW B. 40 mW C. 44 mW D. 36 mW E. 80 mW
A thermodynamic process that happens very quickly tends to be
a. isobaric. b. isothermal. c. isovolumetric. d. adiabatic.
A thin lens of focal length 12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. Where will the image be formed?
A. 2.5 cm behind the lens B. 5.6 cm behind the lens C. 5.6 cm in front of the lens D. 50 cm behind the lens E. 50 cm in front of the lens
Force on a Moving Charge: After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations:Electrons moving upward feel a magnetic force in the northwest direction.Electrons moving horizontally toward the north are pushed downward.Electrons moving horizontally toward the southeast are pushed upward.Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction?
A. toward the east B. toward the northeast C. toward the southwest D. toward the southeast E. toward the west