Three charged particles are positioned in the xy plane: a 50-nC charge at y = 6 m on the y axis, a ?80-nC charge at x = ?4 m on the x axis, and a 70-nc charge at y = ?6 m on the y axis. What is the electric potential (relative to a zero at infinity) at the point x = 8 m on the x axis?
a. +81 V
b. +48 V
c. +5.8 V
d. ?72 V
e. ?18 V
b
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The force of gravity is an inverse square law. This means that, if you double the distance between two large masses, the gravitational force between them
A) also doubles. B) strengthens by a factor of 4. C) weakens by a factor of 4. D) weakens by a factor of 2. E) is unaffected.
Escape speed from Earth is about
1) 8 km/s. 2) 11.2 km/s. 3) more than 11.2 km/s. Interestingly, if a stone released at rest at the far edge of the solar system drops to Earth by virtue of only Earth gravity, it will strike Earth's surface with a speed of about 4) 8 m/s. 5) 10 km/s. 6) 11.2 km/s. 7) more than 11.2 km/s.
A galvanometer has an internal resistance of 100 ? and deflects full-scale at 2.00 mA. What size resistor should be added to it to convert it to a milliammeter capable of reading up to 4.00 mA?
A) 100 ? in series B) 100 ? in parallel C) 50.0 ? in parallel D) 50.0 ? in series
In the context of the excitation of atoms, jumps of electrons from one orbit to another are sometimes called__________
A) magnetic jumps B) transitional jumps C) filtered jumps D) quantum jumps