In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? (
is the velocity of the light wave.)
A.
.B.
C.
D.
E.
Answer: C
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A parallel-plate capacitor is disconnected from a battery, and the plates are pulled a small distance farther apart. Does Q increase, decrease, or stay the same?
1.increase 2.decrease 3.remains the same
A 100-? resistor is connected in series with a 10-mH inductor across an ac source operating at 1000 Hz. What is the impedance of this circuit?
A) 100 ? B) 118 ? C) 200 ? D) 236 ? E) 1000 ?
Suppose you are facing a tall makeup mirror on a vertical wall. Fluorescent tubes framing the mirror carry a clockwise electric current. What is the direction of the field the current creates at a point on the wall outside the frame to the right?
1.left 2.right 3.horizontally toward you 4.horizontally away from you 5.no direction because the field has zero magnitude
The most cost effective way to reduce heat loss from a window is ________
a. add a storm window b. install a triple pane window c. weatherstrip around the outside perimeter of the window d. install a thermal drape