c) Both have the same acceleration

# Category: PHYS 119 – Module Questions

## Consider two isolated spherical conductors each having net charge Q. The spheres have radii a and b, where b>a . Which sphere has the higher potential?

a) The sphere of radius a (It requires more work to move a test charge in to a smaller sphere as opposed to a larger sphere with the same charge.)

## Experimenter A uses a test charge q0 and experimenter B uses a test charge -2q0 to measure an electric field produced by stationary charges. A finds a field that is:

a) the same in both magnitude and direction as the field found by B (The field is the force on the test charge divided by the magnitude of the test charge. It…

## V(x) = y; V(0)=0 x(A) < x(B) The function grows parabolically. At which point is the electric field stronger?

c) At x(A). (|E| = the slope of the potential graph.)

## A 3 μF capacitor is connected to a circuit in series with another 6 μF capacitor. The equivalent capacitance is:

A. 9 μF (For capacitors in parallel, the capacitances add.)

## A parallel plate capacitor with plates of area A and plate separation d is charged so that the potential difference between the plates is V. If the capacitor is then isolated and its plate separation is decreased to d/2, what happens to the potential between the plates?

a) It is one half of its original value. (The capacitance increases by a factor of 2 when the plate separation decreases by a factor of 2. Since the charge remains the…

## A wire of resistance R is stretched uniformly (keeping its volume constant) until it is twice its original length. What happens to the resistance?

e) it increases by a factor of 4 (Keeping the volume constant means that if the length is doubled the area is halved. Since R=rho(L/A), this increases the resistance by a factor…