3) A bug zapper consists of two metal plates connected to a high-voltage power supply. The voltage between the plates is set to give an electric field slightly less than 1*10^6 V/m. When a bug flies b

3) The electric field between the plates is given by the equation E=V/d, where E is the electric field, V is the voltage, and d is the distance between the plates. Rearranging this equation to solve for d gives d=V/E. Substituting the given values of V=3000 V and E=1*10^6 V/m, we get d=3000/10^6=0.003 m = 0.3 cm. 4) The electric field between the poles of a battery is given by the equation E=V/d, where E is the electric field, V is the voltage, and d is the distance between the poles. Rearranging this equation to solve for d gives d=V/E. Substituting the given values of V=1.5 V and E=1*10^-6 V/cm, we need to convert the units to be consistent, so E=1.5*10^4 V/m. Substituting these values, we get d=1.5/1.5*10^4=1*10^-4 m = 0.1 cm = 1 mm. Therefore, the poles of the battery would need to be placed 1 mm apart in order to generate the same electric field as the sharks' ampullae can detect across 1 cm of seawater.