Question 1

Which medical diagnostic tool is shown in the first image, and what physical quantity does it measure?

Accepted Answer

Electroencephalogram (EEG); it measures electric potentials generated by brain activity.

Question 2

The second image shows solar panels and wind turbines. What do these devices have in common in terms of electric potential?

Accepted Answer

They both generate an electric potential difference (voltage) between two points.

Question 3

The third image shows an electric eel. What is remarkable about the electric potential it can generate?

Accepted Answer

It can generate a potential difference of more than 600 volts.

Question 4

The fourth image shows a battery. According to the study materials, what is the emf (electromotive force) of this battery, and what does it represent?

Accepted Answer

1.5 V; the work done per charge to separate positive and negative charges.

Question 5

The fifth image shows a plasma ball. What physical phenomenon allows the 'lightning bolts' to appear inside the ball?

Accepted Answer

A strong electric field causes gas breakdown, creating plasma.

Question 6

The sixth image shows a map of electric potentials on a human torso. What does this map most likely represent?

Accepted Answer

The electric potential distribution on the body surface due to the heart's activity (as in an ECG).

Question 7

The seventh image shows a Van de Graaff generator. What is the main function of this device?

Accepted Answer

To generate a large electric potential difference by mechanically separating charges.

Question 8

The eighth image shows a person with multiple electrodes attached to their chest. What is being measured, and what is the physical principle behind it?

Accepted Answer

The electric potential differences on the body surface due to the heart's electric dipole moment (ECG).

Question 9

The ninth image shows a hammerhead shark. According to the study materials, what unique sense does this animal possess related to electric potential?

Accepted Answer

It can detect extremely weak electric fields generated by prey.

Question 10

The tenth image shows the Sun. According to the study materials, what role does electric potential energy play in the fusion process at the Sun's core?

Accepted Answer

Protons must overcome their mutual electric potential energy barrier to fuse.

Question 11

Which of the following best describes the relationship between electric field and electric potential as visualized in the sixth image (equipotential map)?

Accepted Answer

The electric field is always perpendicular to the equipotential lines and points in the direction of decreasing potential.

Question 12

Which device shown in the images is commonly used to demonstrate the breakdown of air due to a high electric field, and what is the physical effect observed?

Accepted Answer

Plasma ball; visible 'lightning bolts' due to ionization of gas.

Question 13

Which image best illustrates the concept of a source of electric potential difference created by chemical reactions?

Accepted Answer

The battery (image 4).

Question 14

Which image demonstrates the use of electric potential in medical diagnostics for the heart?

Accepted Answer

The image with electrodes on the chest (image 8).

Electric Potential and Electric Potential Energy: Concepts, Applications, and Biological Relevance

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