4. The elephant nose fish which can be found in the Congo River has a special or

Question

4. The elephant nose fish which can be found in the Congo River has a special organ which generates an electric field around its body. The elephant nose fish uses this electric field to detect the presence of other fish. Suppose that another fish located 75cm away from an elephant nose fish causes a 3.0 /C change in its field. How much charge does the other fish have in order to generate such a change? How many electrons are required for this charge? 5. Suppose that 3.25 × 10-20 of work is needed to take one sodium ion (NA+) from the interior of a cell across its membrane to the outside of the cell. What is the potential difference between the inner and outer surfaces of the cell? (Use qo 1.609 x 10-19C 6. The magnitude of electric field at a distance r from a point charge is given by E. F magnitude and direction of the electric field at the center of a square if point charges of m arranged at the corners of the square as in the diagram below: agnitude q are 0

Explanation / Answer

4.

E= kq/r^2

3*10^-6= 9*10^9*q/0.75^2

q= 1.875*10^-16 C

Number of electron,

n= 1.875*10^-16/(1.6*10^-19)= 1172 electrons

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5.

V= W/q= 3.25*10^-20/(1.609*10^-19)= 0.202 V

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6.

Electric field at O is due to only charge M and K

E= 2k*q^2/(L^2/2)= 4kq^2/L^2

Directed at 225 ccw from +x axis

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Comment in case any doubt.. good luck

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