A platypus foraging for prey can detect an electric field as small as 0.002 N/C.To give an idea of sensitivity of the platypus's electric sense, how far from a +40nC point charge does the field have this magnitude?
Electric field due to point charge is given by
E = KQ/r2
=>r=sqrt[KQ/E]
r =sqrt[(9*109)(40*10-9)/0.002]
r = 424.264 m
A platypus foraging for prey can detect an electric field as small as 0.002 N/C.To give...