Resistivity measurements on the leaves of corn plants are a good way to assess s

Question

Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 2.0 M measured between two electrodes placed 20 cm apart along the leaf. The leaf has a width of 2.8 cm and is 0.20 mm thick.

What is the resistivity of the leaf tissue?

Express your answer to two significant figures and include the appropriate units.

Problem 22.21 Enhanced with Feedback Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 2.0 MS2 measured between two electrodes placed 20 cm apart along the leaf The leaf has a width of 2.8 cm and is 0.20 mm thick. You may want to review (DA pages 709-712) Part A What is the resistivity of the leaf tissue? Express your answer to two significant figures and include the appropriate units. Value nits Submit My Answers Give U Part B Is this greater than or less than the resistivity of muscle tissue in the human body? O greater O less Submit My Answers Give Up

Explanation / Answer

R = resistance = 2 *106 ohm

L = length = 20*10-2 m

A = area = width * thickness

A= 2.8*10-2 * 0.2*10-3 = 5.6*10-6 m2

resistivity = R* A / L

resistivity,p = 2*106 *5.6*10-6 / 20*10-2

p= 56 ohm-m

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b) resistivity of muscle tissue is about 1.75 ohm-m.so it is greater than human tissues.

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