The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field during this process?
A)
It increases.
B)
It decreases.
C)
It remains constant.
D)
cannot be determined from the information given
B
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A velocity selector for ions uses perpendicular electric and magnetic fields. If the electric field used were 800 V/m, what magnetic field would allow the selection of a velocity of 4000 m/s?
A. 0.0400 T B. 0.0800 T C. 0.160 T D. 0.200 T E. 0.500 T
An auto accelerates from 7.0 m/s at 0.71 m/s2. It travels a distance of 1.033 km while accelerating
(a) What is the final speed at the end of that displacement? (b) How many seconds did it take to accelerate from 7.0 m/s?
An LC circuit is to have resonant oscillations at 5.0 MHz. Find the value of a capacitor which will work with a 1.0-mH inductor
a. 2.0 mF b. 1.0 ?F c. 0.020 ?F d. 1.0 pF e. 40 pF
Based on this graph, which statement below most accurately describes the impacts we should expect on Earth during the coming year?
A. Only objects smaller than 1 meter across will hit Earth. B. Earth will be hit by at least one object a few meters in diameter, along with many smaller objects. C. Earth will be hit by one object that is a few meters in diameter, but no larger or smaller objects. D. Earth will be hit by one object about 100 meters in diameter and several objects of about 10 meters in diameter.