PHY 112 Exam Questions & Answers
(Grade A+)
Two electrons are 20.0mm apart at closest approach. What is the
magnitude of the maximum electric force that they exert on each
other? -
correct answer ✅5.8x10^-25 N
Two stationary point charges q1 and q2 are shown in the figure
along with a sketch of some field lines representing the electric
field produced by them. What can you deduce from the sketch? -
correct answer ✅q1 is negative and q2 is positive; the magnitude
of q1 is less than the magnitude of q2
For the graph shown in the figure, what physical quantity does the
slope of the graph represent for the ohmic material -
correct answer ✅1/(resistance)
An ideal parallel-plate capacitor has a capacitance of C. If the area
of the plates is doubled and the distance between the plates is
halved, what is the new capacitance? -
correct answer ✅4C
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 between the plates
(Grade A+)
Two electrons are 20.0mm apart at closest approach. What is the
magnitude of the maximum electric force that they exert on each
other? -
correct answer ✅5.8x10^-25 N
Two stationary point charges q1 and q2 are shown in the figure
along with a sketch of some field lines representing the electric
field produced by them. What can you deduce from the sketch? -
correct answer ✅q1 is negative and q2 is positive; the magnitude
of q1 is less than the magnitude of q2
For the graph shown in the figure, what physical quantity does the
slope of the graph represent for the ohmic material -
correct answer ✅1/(resistance)
An ideal parallel-plate capacitor has a capacitance of C. If the area
of the plates is doubled and the distance between the plates is
halved, what is the new capacitance? -
correct answer ✅4C
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 between the plates
