Two long parallel wires carry unequal currents in the same direction. The ratio of the currents is 3 to 1. The magnitude of the magnetic field at a point in the plane of the wires and 10 cm from each wire is 4.0 ?T. What is the larger of the two currents?
A. 5.3 A
B. 3.8 A
C. 4.5 A
D. 3.0 A
E. 0.5 A
Answer: D
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The thermal efficiency e of a heat engine is defined as follows: e=W/Qh. Express the efficiency in terms of Qh and Qc.
The mercury column in an ordinary medical thermometer doubles in length when its temperature changes from 95? F to 105? F. Choose the correct statement:
A. the coefficient of volume expansion of mercury is 0.1 per F? B. the coefficient of volume expansion of mercury is 0.3 per F? C. the coefficient of volume expansion of mercury is (0.1/3) per F? D. the vacuum above the column helps to "pull up" the mercury this large amount E. none of the above is true
The person who expounded the uncertainty principle was __________
Fill in the blank(s) with correct word
Which of these colors of light has photons of lowest energy?
a. Blue b. Green c. Yellow d. Violet