A positive test charge is moved closer to a negative charge. The potential of the system ________ (indicate whether it increases, decreases, or stays the same).
Fill in the blank(s) with the appropriate word(s).
decreases
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Thin strips of iron and zinc are riveted together to form a bimetallic strip that bends when heated. The iron is on the inside of the bend because:
A. it has a higher coefficient of linear expansion B. it has a lower coefficient of linear expansion C. it has a higher specific heat D. it has a lower specific heat E. it conducts heat better
Which of the following statements is true (only one):
a. The growth rate of energy consumption has kept pace with GNP growth. b. Oil use has expanded more than any other fuel since 1940. c. We reached the point last year where we imported no oil. d. Electricity use has actually fallen since 1975.
If you hear thunder 5.0 s after seeing a flash of lightning, the distance to the lightning strike is about
A) 2.2 km. B) 0.60 km. C) 1.7 km. D) 0.90 km. E) 1.2 km.
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 27-6. If there is a current I flowing through this coil, what is the force acting on section AB of this coil?
A) ILB sin? B) ILB cos ? C) ILB D) 0 N E) ILB/2