A person grasps the ends of an electrically conducting copper wire in each hand. The wire has a cross-sectional area of 4.0×10-6 m² and its surface is not insulated. If the person's hands are wet, the resistance of the possible electrical pathway from one hand, up the arm, across the chest and down into the other hand is about 1 kQ. (a) A current of 10 mA can "freeze" the muscles so the hands are clenched around the wires. Estimate the potential difference between the ends of the wire which would cause this. (b) How much power is dissipated in the person's body if this current flows? (c) The ends of the wire are connected to make a circuit that includes a battery. If the person grasps the wire with hands 0.20 m apart, comment on the resistances of the possible paths of electric current. The resistivity of copper is 1.7x10-8 Qm.

A person grasps the ends of an electrically conducting copper wire in each hand. The wire has a cross-sectional area of 4.0×10-6 m² and its surface is not insulated. If the person's hands are wet, the resistance of the possible electrical pathway from one hand, up the arm, across the chest and down into the other hand is about 1 kQ. (a) A current of 10 mA can "freeze" the muscles so the hands are clenched around the wires. Estimate the potential difference between the ends of the wire which would cause this. (b) How much power is dissipated in the person's body if this current flows? (c) The ends of the wire are connected to make a circuit that includes a battery. If the person grasps the wire with hands 0.20 m apart, comment on the resistances of the possible paths of electric current. The resistivity of copper is 1.7x10-8 Qm.

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter18: Direct-Current Circuits

Section: Chapter Questions

Problem 18P: (a) Find the current in each resistor of Figure P18.18 by using the rules for resistors in series...

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