Consider a uniform electric field of 50. N/C directed toward the East. If the voltage measured relative to ground at a given point in the field is 80. V, what is the voltage at a point 1.0 m directly South of that point?
A) zero
B) 30 V
C) 50 V
D) 80 V
E) 50. kV
D
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Why is the sky blue?
A) Air molecules scatter blue light more effectively than red light. B) The gases in Earth's atmosphere emit blue light. C) The Sun mainly emits blue light. D) The atmosphere transmits mostly blue light. E) Because of the way light is reflected off of the oceans.
An ideal ammeter is one that does not change the behavior of a circuit when it is properly used to measure current. The internal resistance of such a meter is
A) infinite. B) dependent on the circuit. C) 0 ?. D) the same resistance as the circuit. E) cannot be determined
Two charged bodies separated by a distance d exert an electrical force on each other. The charge on one of the bodies is doubled. The electrical forces on each body now
a. double. b. decrease by 1/2. c. stay the same. d. differ—the force on the other body doubles, but the force on the body whose charge was changed stays the same as before. e. increase by a factor of four.
You are making macaroni and cheese for dinner, again. Which is the best choice for stirring the noodles in the pot of boiling water?
A. a wooden spoon B. a metal spoon C. any kind of spoon D. your finger, but really fast