The diagrams below show two uniformly charged spheres. The charge on the right sphere is 3 times as large as the charge on the left sphere. Which force diagram best represents the magnitudes and directions of the electric forces on the two spheres?
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Physics & Space Science
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Reactance: Consider a capacitor connected across the ac source. As the capacitance is increased, the current through the capacitor will
A. increase. B. remain constant. C. decrease.
Physics & Space Science
The magnetic dipole moment of an electron (charge = ?e; mass = me) moving in a circular orbit of radius r with speed v about a nucleus of mass mN is proportional to
a. r. b. v. c. vr. d. evr. e. mNvr.
Physics & Space Science
If a force on an object is aimed perpendicular to the direction of the object's velocity, the force does
a. no work c. negative work b. positive work d. any of the above
Physics & Space Science
Galileo used a telescope to discover
a. spots on the Sun. b. craters on the Moon. c. moons around Jupiter. d. moon-like phases of Venus. e. all of above.
Physics & Space Science