An ion with charge +q is in a region of uniform electric field of magnitude E. T
ID: 1637186 • Letter: A
Question
An ion with charge +q is in a region of uniform electric field of magnitude E. The charge is moved a distance d in the direction of the field.
Which of the following is TRUE?
Select one:
a. The electric potential energy of the ion decreases by the amount qEd.
b. The electric potential energy of the ion increases by the amount qEd.
c. The electric potential energy of the ion increases by the amount qE/d.
d. The electric potential energy of the ion decreases by the amount qE/d.
e. The electric potential energy of the ion increases by the amount Ed.
f. The electric potential energy of the ion decreases by the amount Ed.
The membrane potential
Select one:
a. is positive at rest.
b. is set predominantly by the relatively large number of open K+ channels at rest.
c. has no effect on ion channel properties.
d. is independent of all ion transporter activity.
e. is not affected by cell permeability.
Activity of the sodium/potassium ATPase pump
Select one:
a. causes the membrane potential to be negative
b. reduces the amount of sodium in the neuron
c. increases the amount of potassium in the neuron
d. requires energy usage
e. All of the other options are correct
Explanation / Answer
(1) force on charge= F = qE
potential energy=work done= force .d= qEd
since the charge is moving in the direction of field , its potential energy will decrease.so option (a) is correct.
(2) the membrane potential is is set predominantly by the relatively large number of open K+ channels at rest.so option (b) is correct.
(3) Activity of the sodium/potassium ATPase pump causes the membrane potential to be negative. it also reduces the amount of sodium in the neuron, increases the amount of potassium in the neuron and requires energy usage. so option (e) is correct.
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