Resistivity Method in Geophysics

What is resistivity?

• The resistance of a material

• The ability of a material to conduct electricity

• The measure of a material's opposition to the flow of electric current
  

• The voltage drop across a conductor

In geophysics, what is the typical unit of electrical resistivity?

• Ohms (Ω)

• Amperes (A)

• Volts (V)

• Ohm-meters (Ω·m)

Which factor does not affect the resistivity of a material?

• Temperature

• Length of the material

• Cross-sectional area of the material

• Voltage applied across the material

What is the formula for calculating resistance using resistivity?

• R = V/I

• R = ρL/A

• R = I/V

• R = A/L

How is electrical resistivity related to the porosity of rocks in geophysics?

• Higher porosity corresponds to higher electrical resistivity

• Higher porosity corresponds to lower electrical resistivity

• The relationship between porosity and electrical resistivity is unpredictable

What is the general arrangement of electrodes used in an electrical resistivity survey?

• One current electrode and one potential electrode

• Two current electrodes and two potential electrodes

• Multiple current electrodes and one potential electrode

• One current electrode and multiple potential electrodes

What is the term used to describe the reciprocal of electrical resistivity?

• Inductance

• Capacitance

• Conductance

• Susceptance

Electrical resistivity surveys are sensitive to the presence of metallic objects such as buried pipes or cables.

• True

• False

Increasing the spacing between electrodes will result in a decrease in the_____

• Resolution

• Depth

• Error

• Resistivity

What is the symbol for electrical resistivity?

• I

• R

• V

• ρ