9.3 Electric Field And Potential

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Electrical field is the space between particles that are charged positively charged and negatively charged. Having covered the topic on electricity fields and potential the quiz below is designed to ensure that you are ready for upcoming quiz. Give it a shot and all the best in the quiz. Good luck!

• 1.

Define Electric Potential Energy at point P.

• A.

Work done in moving 1 Coulomb from the floor to a point P

• B.

Work done in moving a small test charge from the floor to a point P

• C.

Work done in moving 1 Coulomb from infinity to a point P

• D.

Work done in moving a small test charge from infinity to a point P

• E.

Work done in moving a 1 coulomb from the the surface of the charged sphere to a point P

• F.

Work done in moving a test charge from the surface of the charged sphere to a point P

D. Work done in moving a small test charge from infinity to a point P
Explanation
The correct answer is "work done in moving a small test charge from infinity to a point P". This is because electric potential energy at a point is defined as the work done in moving a small test charge from infinity to that point. Moving a small test charge from infinity to a point P requires work to be done against the electric field, and this work done is equal to the electric potential energy at that point.

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• 2.

Define Electric Potential at point P.

• A.

Work done per unit charge in moving small test charge from the floor to a point P

• B.

Work done in moving a test charge from the floor to a point P

• C.

Work done in moving small test charge from infinity to a point P

• D.

Work done per unit charge in moving small test charge from infinity to a point P

• E.

Work done in moving a small test charge from the the surface of the charged sphere to a point P

• F.

Work done per unit mass in moving a test charge from the surface of the charged sphere to a point P

D. Work done per unit charge in moving small test charge from infinity to a point P
Explanation
The correct answer is "work done per unit charge in moving small test charge from infinity to a point P." This is because the electric potential at a point is defined as the work done per unit charge in bringing a small test charge from infinity to that point. It represents the amount of electric potential energy per unit charge at that point.

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• 3.

What is the electric  field strength?

• A.

Force acting on a point charge

• B.

Force acting per unit charge on a point charge

• C.

Electric Potential Energy acting on a point charge.

• D.

Electric Potential Energy per unit charge acting on a point charge.

B. Force acting per unit charge on a point charge
Explanation
The electric field strength is defined as the force acting per unit charge on a point charge. This means that it measures the force experienced by a point charge divided by the amount of charge it possesses. It is a measure of the intensity of the electric field at a specific point in space.

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• 4.

How is the electric field strength related to the electric potential?

• A.

Electric field strength = electric potential

• B.

Electric field strength = electric potential energy

• C.

Electric field strength = electric potential gradient

C. Electric field strength = electric potential gradient
Explanation
The electric field strength is related to the electric potential gradient. The electric field strength represents the force experienced by a charged particle in an electric field, while the electric potential gradient represents the change in electric potential per unit distance. Therefore, the electric field strength is directly proportional to the electric potential gradient, as a larger change in electric potential over a given distance will result in a stronger electric field.

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• 5.

How can you calculate the electric potential at the surface of the charge sphere?

• A.

Electric Potential = electric field strength

• B.

Electric Potential = (electric field strength)/(Radius of sphere)

• C.

Electric Potential = (electricfield strength)x (radius of sphere)

C. Electric Potential = (electricfield strength)x (radius of sphere)
Explanation
The correct answer is electric Potential = (electric field strength) x (radius of sphere). The electric potential at the surface of a charged sphere can be calculated by multiplying the electric field strength by the radius of the sphere. This relationship holds true because the electric potential is directly proportional to the electric field strength and the distance from the center of the sphere, which is represented by the radius. Therefore, the electric potential at the surface of the sphere is determined by the product of these two factors.

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• 6.

What is the relationship between equipotential lines and lines of force.

• A.

They are parallel to each other

• B.

They are equidistant

• C.

The are perpendicular to each other

C. The are perpendicular to each other
Explanation
Equipotential lines and lines of force are perpendicular to each other. This means that at any point on an equipotential line, the electric potential is the same. On the other hand, lines of force represent the direction of the electric field, which is always perpendicular to the equipotential lines. This relationship is important in understanding the behavior of electric fields and the distribution of charges in a system.

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• 7.

Describe the lines of equipotential near to a charged sphere.

• A.

Lines move radially away from the centre of the sphere

• B.

Lines are concentric and spaced equidistant from each other

• C.

Lines are concentric and spaced further apart from each other as they move away from the centre of the sphere.

C. Lines are concentric and spaced further apart from each other as they move away from the centre of the sphere.
Explanation
The lines of equipotential near a charged sphere are concentric, meaning they form circles around the sphere. These lines are spaced further apart from each other as they move away from the center of the sphere. This indicates that the electric potential decreases as the distance from the sphere increases. The spacing between the lines represents the strength of the electric field, with larger spacing indicating weaker electric field strength.

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• 8.

An electric field is set up between two parallel  plates which are 20cm apart.  The potential difference between the plates is 100V.  Calculate the stength of the electric field between the plates.

• A.

2000 N/C

• B.

500 N/C

• C.

200 N/C

• D.

50 N/C

• E.

20 N/C

• F.

5 N/C

• G.

2 N/C

• H.

0.5 N/C

• I.

0.2 N/C

B. 500 N/C
Explanation
The strength of the electric field between the plates can be calculated using the formula E = V/d, where E is the electric field strength, V is the potential difference, and d is the distance between the plates. In this case, the potential difference is given as 100V and the distance between the plates is 20cm (or 0.2m). Plugging these values into the formula, we get E = 100V / 0.2m = 500 N/C. Therefore, the strength of the electric field between the plates is 500 N/C.

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• 9.

• 10.

Are there any parts of this topic which are difficult and you would like to go over in class?  Ask a specific question.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Feb 10, 2013
Quiz Created by
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