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ning.com/ibi php?id-4953442 Student Portal-21" ww.sapingl." Getting Started D2L -BlMe: Free APA BL eGran 1/24/2018 06:00 PM ) T74/100 -Print Cakulator Perodic Table stion 9 of 9 presened by Sapling Leai The 9-inch-long elephant nose fish in the Congo River generates a weak electric field around its body using an organ in its tail. When small prey (or even potential mates) swim within a few feet of the fish shey perturb the electric field. The elephant nose. These remarkable fish can detect changes in the electric feild as small as 3.00 JNIC in the field is picked up by electric sensor cells in the skin of the How much charge (modeled as a point charge) in the fish would be needed to produce such a change in the electric field at a distance of 61.5 am? How many electrons would be required to create that electrons 888 a 3 4

Explanation / Answer

E = electric field change = 3 x 10-6 N/C

Q = magnitude of charge = ?

r = distance of charge from the point = 61.5 cm = 0.615 m

using the equation

E = k Q/r2

3 x 10-6 = (9 x 109) Q/(0.615)2

Q = 1.3 x 10-16 C

q = charge on a single electron = 1.6 x 10-19

number of electrons needed is given as

n = Q/q

n = (1.3 x 10-16)/(1.6 x 10-19)

n = 812

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