A nerve signal is transmitted along the long, thin axon of a neuron in a small f

Question

A nerve signal is transmitted along the long, thin axon of a neuron in a small fish. The transmission occurs as sodium ions Na+ transfer like tipping dominos across the axon membrane from outside to inside Each short section of axon gets an excess of about 6 times l0^8 sodium ions/mm. Part A Determine the E field 4.0 cm from the axon produced by the excess sodium ions on the inside of the axon and an equal number of negative ions on the outside of a 1 mm length of axon. There are separated by the 8 times 10^-9 m thick axon membrane. Use k = 80 for the dielectric constant of water.

Explanation / Answer

answer would be zero because of we draw a cylindrical guassian surafce of radius 4cm and length 1mm enclosing the axon of length 4cm, then total enclosed charge would be zero as there are equal no. of positive sodium ions and negative ions so using gauss law, electric field would be zero.

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