A uniformly charged rod (length = 2.0 m, charge per unit length = 5.0 nC/m) is bent to form one quadrant of a circle. What is the magnitude of the electric field at the center of the circle?
a. 62 N/C
b. 56 N/C
c. 50 N/C
d. 44 N/C
e. 25 N/C
C
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Which best describes the proper time interval between two events?
A. the longest interval measured by any inertial observer B. the interval measured in the reference frame in which the two events occur a maximum distance from each other C. the interval measured in a reference frame in which the two events are simultaneous D. the interval measured in a reference frame in which the two events occur at the same place E. None of these choices are correct
Exclusion Principle: The orbital angular momentum quantum number can take which of the following values for any given value of the principal quantum number, n?
A. ? = 0, 1, 2, . . . B. ? = 0, 1, 2, . . . , n C. ? = 0, 1, 2, . . . , (n - 1) D. ? = 1, 2, 3, 4, . . . E. ? = 1, 2, 3, 4, . . ., (n + 1)
Meters: A galvanometer with a coil resistance of 40.0 ? deflects full scale for a current of 2.0 mA. What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for 50 V?
A. 25 k? B. 27 k? C. 29 k? D. 31 k?
Energy used for production of ethanol from corn is _____than the energy output
a. more b. less c. the same