Question

In: Physics

3. Within a cell membrane there is an electric field that is typically about 9×10 6...

3. Within a cell membrane there is an electric field that is typically

about 9×10

N/C, directed from the outside of the cell toward the inside.

The membrane is almost completely permeable to negative chloride

(Cl

–

) ions, which have charge –1.6×10

-19

C and mass 5.8×10

-26

kg.

(a) If a chloride ion gets into the membrane on

one

side, it will experience

a force that causes it to cross the membrane – but if it starts on the other side, it

will

not

cross. Why, and from which side (inside or outside)

will

it cross the membrane?

(b) Find the electric force (magnitude and direction) on a chloride ion that gets inside the

membrane.

membrane is 8×10

-9

m thick,

how much time will it take the ion to cross to the other side?

(d) How does the force on a chloride ion compare with the force on a potassium ion (charge

+1.6×10

-19

C , mass 6.5×10

-26

kg) inside the membrane?

Solutions

Expert Solution

genius_generous answered 2 years ago

Next > < Previous

Related Solutions

A uniform electric field with a magnitude of 6 × 10^6 N/C is applied to a...

A uniform electric field with a magnitude of 6 × 10^6 N/C is applied to a cube of edge length 0.1 m as seen in Fig 22-2 above. If the direction of the E - field is along the +x-axis, what is the electric flux passing through the shaded face of the cube?

9) The site of the bacterial cell where ATP is produced is the: a) plasma membrane...

9) The site of the bacterial cell where ATP is produced is the: a) plasma membrane b) cell wall c) flagella d) nuclear region e) cytoplasm 44) Which of the following is regulated by an operator: a) DNA sythesis b) protein synthesis c) RNA synthesis d) b and c e) all of the above 44) Which of the following is regulated by an operator: a) DNA sythesis b) protein synthesis c) RNA synthesis d) b and c e) all of...

(6) In the presence of an applied electric field, the bandgap of a semiconductor effectively ( )...

(6) In the presence of an applied electric field, the bandgap of a semiconductor effectively ( ) (A) Increases with increasing electric field, and decreases with decreasing temperature (B) Decreases with increasing electric field, and increases with decreasing temperature (C) Decreases with increasing electric field, and decreases with decreasing temperature (D) Increases with increasing electric field, and increases with decreasing temperature

A uniform electric field is directed out of the page within a circular region of radius...

A uniform electric field is directed out of the page within a circular region of radius R = 2.50 cm. The magnitude of the electric field is given by E = (3.50 × 10-3 V/m•s)t, where t is in seconds. What is the magnitude of the magnetic field that is induced at radial distances (a)1.50 cm and (b)6.50 cm?

A magnetic field has a magnitude of 1.2e-3 T, and an electric field has a magnitude...

A magnetic field has a magnitude of 1.2e-3 T, and an electric field has a magnitude of 5.1e3 N/C. Both fields point in the same direction. A positive -1.8 microC moves at a speed of 3.5e6 m/s in a direction that is perpendicular to both fields. Determine the magnitude of the net force that acts on the charge.

9) Consider a 4.00 C charge. What is the magnitude of the electric field it creates...

9) Consider a 4.00 C charge. What is the magnitude of the electric field it creates 2.56 m directly up from it? 10) Which direction is this electric field pointed? Select one: Right, Down, Left, Up 11) Consider a -4.00 C charge. What is the magnitude of the electric field it creates 2.56 m directly down from it? 12) Which direction is this electric field pointed? Select one: Up, Left, Right, Down 13) An electric field of intensity 3.50*103 N/C...

Within a capacitor, what would happen to the changing electric field, if the displacement current's magnetic...

Within a capacitor, what would happen to the changing electric field, if the displacement current's magnetic field(Bd) was increased or decreased by an exterior source(Exterior B)? Please explain, and relate it to the discharge/charge states(Assume the capacitor was either charging, discharging while the exterior magnetic field was introduced for a short duration of time).

For the parallel plate pattern, does the electric field strength change within the region between the...

For the parallel plate pattern, does the electric field strength change within the region between the plates? Explain your answer. Describe the trajectory of a negative charge if it were midway between the plates with a velocity directed parallel to the plates.

Suppose that a molecular ion with charge -10e is embedded within the 5.0-nm-thick cell membrane of...

Suppose that a molecular ion with charge -10e is embedded within the 5.0-nm-thick cell membrane of a cell with membrane potential -70 mV. What is the electric force on the molecule?

k=9.00*10^9 Nm^2/C^2. Pay attention to unit conversions. In one experiment the electric field is measured for...

k=9.00*10^9 Nm^2/C^2. Pay attention to unit conversions. In one experiment the electric field is measured for points at distances r from a very long, straight line of charge that has a charge per unit length λ. In a second experiment, the electric field is measured for points at distances from the center of a uniformly charged insulating sphere that has total charge Q and radiusR = 8.00 mm. The results of the two measurements are listed in the table below,...

Subjects