Question

The membrane surrounding a living cell consists of an inner and an outer wall that are...

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. Assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 C/m2. (a) What is the magnitude of the electric field within the cell membrane? (b) Find the magnitude of the electric force that would be exerted on a potassium ion (K+; charge = +e) placed inside the membrane.

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

From the given data we have,

effective charge density on inner and outer walls =7.0* C/

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Many cells in the body have a cell membrane whose inner and outer surfaces carry opposite...
Many cells in the body have a cell membrane whose inner and outer surfaces carry opposite charges, just like the plates of a parallel-plate capacitor. Suppose a typical cell membrane has a thickness of 8.5×10−9 m , and its inner and outer surfaces carry charge densities of -6.3×10−4 C/m2 and +6.3×10−4 C/m2 , respectively. In addition, assume that the material in the cell membrane has a dielectric constant of 5.5. 1. Find the direction of the electric field within the...
Cell Membranes and Dielectrics Many cells in the body have a cell membrane whose inner and...
Cell Membranes and Dielectrics Many cells in the body have a cell membrane whose inner and outer surfaces carry opposite charges, just like the plates of a parallel-plate capacitor. Suppose a typical cell membrane has a thickness of 8.4×10−9 m , and its inner and outer surfaces carry charge densities of -5.3×10−4 C/m2 and +5.3×10−4 C/m2 , respectively. In addition, assume that the material in the cell membrane has a dielectric constant of 5.4. Part A Find the direction of...
A typical cell has a membrane potential of -70 mV, meaning that the potential inside the...
A typical cell has a membrane potential of -70 mV, meaning that the potential inside the cell is 70 mV less than the potential outside due to a layer of negative charge on the inner surface of the cell wall and a layer of positive charge on the outer surface. This effectively makes the cell wall a charged capacitor. Because a cell's diameter is much larger than the wall thickness, it is reasonable to ignore the curvature of the cell...
Some cell walls in the human body have a layer of negative charge on the inside...
Some cell walls in the human body have a layer of negative charge on the inside surface and a layer of positive charge of equal magnitude on the outside surface. Suppose that the charge density on either surface is ± 0.50×10−3 C/m2, the cell wall is 5.1 nm thick, and the cell-wall material is air. Notes about Problem 18.77 and a Hint for Part D: The cell wall/membrane creates a separation of charge between the inside and outside of a...
Assume that a red blood cell is spherical with a radius of 4.5×10−6m and with wall...
Assume that a red blood cell is spherical with a radius of 4.5×10−6m and with wall thickness of 9.5 ×10−8m. The dielectric constant of the membrane is about 5.0. The potential difference across the membrane is 0.080 VV. 1. Assuming the cell is a parallel plate capacitor, estimate the capacitance of the cell ? 2.Determine the positive charge on the outside and the equal-magnitude negative charge inside?
1.A neuron is a cell which carries electric current. Suppose that a neuron has a 6.0...
1.A neuron is a cell which carries electric current. Suppose that a neuron has a 6.0 nm thick membrane. Its outside and inside surfaces contain charge, and the dielectric constant of the membrane is 7.0. Estimate, to one significant figure, the capacitance of this membrane per m2 by modeling it as a parallel-plate capacitor. 2. Charges −q and q are placed at the points (0, d/2) and (0, −d/2), respectively. A third charge +Q is placed at (s, 0). Find...
(part 1) An air-filled capacitor consists of two parallel plates, each with an area of 3.95...
(part 1) An air-filled capacitor consists of two parallel plates, each with an area of 3.95 cm2 , separated by a distance of 2.76 mm . A 17.7 V potential difference is applied to these plates. Find the magnitude of the electric field between the plates. The permittivity of free space is 8.8542 × 10−12 C 2 /N · m2 . Answer in units of kV/m.   (part 2) Find the capacitance. Answer in units of pF. (part 3) Find the...
1,The same voltage is applied between the plates of two different capacitors. When used with capacitor...
1,The same voltage is applied between the plates of two different capacitors. When used with capacitor A, this voltage causes the capacitor to store 15 μC of charge and 3.4 x 10-5 J of energy. When used with capacitor B, which has a capacitance of 7.9 μF, this voltage causes the capacitor to store a charge that has a magnitude of qB. Determine qB. 2,The membrane that surrounds a certain type of living cell has a surface area of 6.0...
The net charge difference across the membrane, just like the charge difference across the plates of...
The net charge difference across the membrane, just like the charge difference across the plates of a capacitor, is what leads to the voltage across the membrane. How much excess charge (in picocoulombs, where 1 pc = 1x10-12 C) must lie on either side of the membrane of an axon of length 2 cm to provide this potential difference (0.07 V) across the membrane? You may consider that a net positive charge with this value lies just outside the axon...
A spherical capacitor is formed from two concentric spherical conducting shells separated by vacuum. The inner...
A spherical capacitor is formed from two concentric spherical conducting shells separated by vacuum. The inner sphere has a radius of rarar_a = 12.5 cmcm , and the outer sphere has a radius of rbrbr_b = 14.9 cmcm . A potential difference of 120 VV is applied to the capacitor. Part A What is the capacitance of the capacitor? Use ϵ0 = 8.85×10−12 F/mF/m for the permittivity of free space. Part B What is the magnitude E1 of the electric...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT