The charge on the square plates of a parallel-plate capacitor is Q
The potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. The amount of charge on the plates is now equal to A) 4Q.
B) 2Q.
C) Q.
D) Q/2.
E) Q/4.
D
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A UFO is
A) an unidentified object seen in the sky B) an alien spaceship C) a hoax D) a natural phenomenon
Two children, Ahmed and Jacques, ride on a merry-go-round. Ahmed is at a greater distance from the axis of rotation than Jacques. Which of the following are true statements? (There could be more than one correct choice.)
A) Jacques has a greater angular speed than Ahmed. B) Jacques and Ahmed have the same angular speed. C) Jacques has a smaller angular speed than Ahmed. D) Ahmed has a greater tangential speed than Jacques. E) Jacques and Ahmed have the same tangential speed.
What is the resistance of a wire made of a material with a resistivity of 3.2 × 10^?8 ? / m if its length is 2.5 m and its diameter is 0.50 mm?
a. 0.16 ? b. 0.10 ? c. 1.28 ? d. 0.41 ? e. 0.81 ?