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Physics with MasteringPhysics | 4th Edition | ISBN: 9780321541635 | Authors: James S. Walker
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BIO Resistance and Current in the Human Finger The

Chapter 21, Problem 22P

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Problem 22P

BIO Resistance and Current in the Human Finger The interior of the human body has an electrical resistivity of 0.15 Ω · m.

(a) Estimate the resistance for current flowing the length of your index finger. (For this calculation, ignore the much higher resistivity of your skin.)

(b) Your muscles will contract when they carry a current greater than 15 mA. What voltage is required to produce this current through your finger?

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QUESTION:

Problem 22P

BIO Resistance and Current in the Human Finger The interior of the human body has an electrical resistivity of 0.15 Ω · m.

(a) Estimate the resistance for current flowing the length of your index finger. (For this calculation, ignore the much higher resistivity of your skin.)

(b) Your muscles will contract when they carry a current greater than 15 mA. What voltage is required to produce this current through your finger?

ANSWER:

Step 1 of 3

(a)

Here we need to find the resistance for the flow of electric current through the length of the finger index. The electrical resistivity of the human body is given to be . Also, the length of the finger index is taken as .

Area can be calculated by taking , .

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