. Spring16 . KALK Activities and Due Dates HW due 1 /28 2016 09:30 AM 443/1001/2
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. Spring16 . KALK Activities and Due Dates HW due 1 /28 2016 09:30 AM 443/1001/27/2016 11:01 AM Print CalculatorPeriodic Table 1 of 21 UNIVERSITY PHYSICS Map cresented by saping learning 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, they perturb the electric field. The change in the field is picked up by electric sensor cells in the skin of the elephant nose. These remarkable fish can detect changes in the electric field as small as 3.00 N/C How lecithe th anodeaic an ointchei the ish would be needed to produce such a change in the electric field at a distance of 93.5 cm? Number How many electrons would be required to create that charge? Number electrons Tools x 101 Prevous @check Answer 0 Next Ext emExplanation / Answer
a) E = kq/r^2 ==> q=Er^2/k
q= 3*10^-6*(0.935)^2/9*10^9 = 2.914 *10^-16 C
b) As q=ne ==> n=q/e
n=2.914*10^-16/1.6*10^-19 =1821.25
So No. of electrons required to create that charge=1821
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