Deck 1: Physical Foundations Ii: Electrical Force Potential Capacitance and Current

Question 1

The ele ctr ica l po ten tial a ro un d a ne ga tive ch ar ge is

A) Negative and proportional to the charge
B) Negative and proportional to the square of the charge
C) Positive and proportional to the charge
D) Positive and proportional to the square of the charge
E) Negative and proportional to the inverse square of the distance.

Answer 1

A

Question 2

The ele ctr ic fo rc e o n a n io n in so lutio n is

A) qE (q is the ch arge an d E is the elec tric field intens ity)
B) dV/dx (V is the voltage)
C) -dV/dx (V is the voltage)
D) þv (v is the ve locity, þ is the d rag c oef ficient)
E) v C (v is the velocity, C is the concentration)

Answer 2

A

Question 3

Increasing the plate separation decreases the capacitance because

A) It takes more energy to separate charge by a greater distance
B) Mo re ch arge can fit on the plate
C) Les s ch arge can fit on the plate
D) It takes less energy to separate charge by a greater distance
E) The electric field won't be homogenous

Answer 3

A

Question 4

Doub ling the plate separation of a cap acitor

A) Doubles the capacitance
B) Halves the capacitance
C) Doesn't do anything to the capacitance.
D) Increases the capacitance b y a factor or 4
E) Decreases the capacitance by a factor of 4

Question 5

A conservative force

A) ha s n o p ote ntia l as so cia ted with it
B) Does positive work on an object around any closed loop
C) Has p otential difference s that dep end o nly on the final and initial state
D) R ep els
E) Attrac ts

Question 6

Which is NOT a characteristic of a conservative force

A) The work done by the force around any closed loop is zero.
B) The force is the charge times the negative gradient of the potential
C) The potential is path-independent
D) The po tential diffe renc e be twee n an y two po ints de pen ds o n the points but n ot the path
E) The force is the negative product of the charge (mass, charge) and the field intensity.

Question 7

Doubling the area and plate separation of a capacitor

A) Increases capacitance b y a factor of 4
B) Decre ases c apacitance by a factor of 4
C) Increases capacitance b y a factor of 2
D) Decre ases c apacitance by a factor of 2
E) Leaves capacitance unchanged.

Question 8

Increasing the thickness of a mem brane, such as adding layers in myelinated nerves

A) Increases the capacitance and Increases the charge required per unit potential
B) Decreases the capacitance and Increases the charge required per unit potential
C) Increases the capacitance and decreases the charge required per unit potential
D) Decreases the capacitance and decreases the charge required per unit potential
E) Decreases the capacitance but has no effect on the charge required because it Increases the area

Question 9

The ele ctr ica l po ten tial

A) Does negative work on an object around any closed loop
B) Does positive work on an object around any closed loop
C) Dep ends only on the final state
D) Is a non-conservative force
E) Is the ratio of coulombs to joules