15 Questions
Which of the following is true about electric charge?
A proton and an electron have the same charge.
What is the SI unit of charge?
Coulomb
Which of the following materials is a good conductor of electricity?
Copper
Which device is used to measure the electrical potential differences on the surface of the skin?
ECG machine
What is the SI unit of capacitance?
Farad (F)
What is the formula for calculating capacitance?
C = KVd
What is the SI unit of electric current?
Ampere (A)
According to Coulomb's law, the force between two electric charges is directly proportional to the product of the charges and inversely proportional to their separation squared. Which of the following statements is true about the force between two charges?
The force is attractive if the charges have opposite signs
What is the magnitude and direction of the electric force acting on q2, if q1 = 4μC, q2 = 3μC, and the distance separating them is 1m?
0.108 N, East (+x)
Which of the following materials is an insulator?
Glass
What is polarization?
The separation of charge within an object that has a net charge
According to the text, which of the following is true about Ohmic materials?
The resistance of Ohmic materials is constant and independent of the potential difference.
What is the resting membrane potential of a nerve cell?
-70 to -90 mV
What happens to the cell membrane permeability during an active potential?
The cell membrane permeability to sodium increases suddenly.
What is the relationship between signal conduction velocity in a nerve axon and capacitance?
Signal conduction velocity is inversely proportional to capacitance.
Test your knowledge of ECG measurements and their significance in detecting abnormal heart rhythms. Learn about the electrical potential differences on the skin's surface and the role of electrodes in the process.
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