During an operation, one of the electrical instruments in use has its metal case shorted to the 120-V “hot” wire that powers it. The attending physician, who is isolated from ground because of rubber-soled shoes, inadvertently touches the case with his elbow, while simultaneously touching the patient’s chest with his opposite hand. The patient, lying on a metal table, is well grounded.
(a) Draw a schematic circuit diagram of this potentially dangerous complete circuit.
(b) If the patient’s head-to-ground resistance is 2200-Ω, what is the minimum resistance for the physician so that they both feel, at most, a “mild shock”?