A horizontal straight wire carries a current from east to west. The resulting magnetic field lines are
A. straight lines perpendicular to the wire.
B. closed circles perpendicular to the wire directed counterclockwise as viewed from the east.
C. parallel to the wire from east to west.
D. closed circles perpendicular to the wire directed clockwise as viewed from the east.
E. parallel to the wire from west to east.
Answer: D
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a. dekagram b. centigram c. gram d. kilogram
A lightbulb drawing a current of 0.60 A is run for 2.0 hours. How many electrons pass through the bulb during this process?
a. 2.7 × 10^22 b. 1.4 × 10^19 c. 5.4 × 10^25 d. 4.3 × 10^3
A mass src="https://sciemce.com/media/4/67174e56c9eba0e835.png" class="w-image" />?
is connected by a light string that passes over a pulley of mass M to a mass 
as shown in the figure. Both masses move vertically and there is no slippage between the string and the pulley. The pulley has a radius of 20.0 cm and a moment of inertia of 1?2 
If 
is 3.00 kg, 
is 6.00 kg and M is 4.00 kg, then what is the tension in the string that is attached to mass
A. 33.6 N
B. 42.8 N
C. 53.6 N
D. 63.4 N
E. 75.5 N
If the distance between the slits in Young's two-slit experiment is decreased, which one of the following statements is true of the interference pattern?
A) The distance between the maxima stays the same. B) The distance between the maxima decreases. C) The distance between the minima stays the same. D) The distance between the minima increases. E) Impossible to tell without knowing the wavelength of light in use.