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Questions and Answers
Which faculty focuses on the study of technology?
Who is the author of the document?
What is the common theme among the faculties mentioned?
Which of the following would NOT likely be a part of the Faculty of Applied Health Science?
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Which faculty is most likely to cover topics in information technology?
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What determines the total electric field at a point due to multiple charges?
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What happens to the small positive test charge $q_0$ when placed near a larger positive charge $Q$?
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Which factor is NOT relevant when calculating the electric field due to a group of charges at a specific point?
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Which statement accurately describes the relationship between $q_0$ and $Q$?
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When multiple electric fields interact at a point, what must be done to determine the resultant field?
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How does the magnitude of charge $Q$ affect the behavior of $q_0$ when both are positive?
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What is an essential property of electric fields produced by multiple charges?
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If a negative charge were introduced to the system containing $q_0$ and $Q$, what would happen?
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Which of the following statements about electric fields from multiple charges is incorrect?
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What determines the direction of the force experienced by the test charge $q_0$?
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What results from the forces acting on the dipole?
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What is the primary effect of the torque on the dipole?
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What is the role of the forces +F and -F in relation to the dipole?
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What happens to the forces acting on the dipole's charges?
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How does the dipole react to the equal and opposite forces?
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What is the expression used to calculate the force (F) in electric fields?
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If the force on a charge 𝒒𝟎 is $3.2 × 10^{-15} N$, what could be the value of the electric field (E) if the charge is $1.6 × 10^{-19} C$?
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Given two charges, 𝒒𝟏 = 7μC and 𝒒𝟐 = -5μC, what is the net force acting on 𝒒𝟐 if it is located 0.3m from 𝒒𝟏?
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Which of the following statements about electric fields is accurate?
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What is the unit of charge used in the given example?
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Where are the electric field lines closest together?
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What does it indicate if the density of electric field lines through surface A is greater than through surface B?
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How is the strength of the electric field represented by field lines?
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What does it mean for electric field lines to be far apart?
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In which of the following scenarios would you expect to find electric field lines spaced far apart?
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Study Notes
Physics II (PHY211)
- Course offered by the Faculty of Applied Health Science Technology, Faculty of Computer Science and Engineering at New Mansoura University
- Course taught by Dr. Mohamed EL-Henawey
Electric Fields
- An electric field exists in the region surrounding a charged object, the source charge
- The presence of an electric field can be detected by placing a test charge in the field and measuring the electric force on it.
- Example: A small positive test charge near a larger positive charge.
Electric Field Vector
- Defined as the electric force on a positive test charge divided by the test charge
- Formula: E = Fe / qo (where E is the electric field vector, Fe is the electric force, and qo is the test charge)
- Units: Newtons per Coulomb (N/C)
- Direction: The direction of the electric field is the same as the direction of the force on a positive test charge.
The Electric Field of a Point Charge
- According to Coulomb's law: Fe = k * (q * qo) / r^2 (where k is Coulomb's constant, q is the source charge, qo is the test charge, and r is the distance between the charges)
- Electric field vector formula: E = k * q / r^2 (where k is Coulomb's constant, q is the source charge, and r is the distance between the charges)
Electric Field Direction
- For a positive source charge, the field is directed away from the charge
- For a negative source charge, the field is directed towards the charge
Electric Fields from Multiple Charges
- The total electric field at a point due to multiple charges is the vector sum of the electric fields due to each individual charge
- Formula: E = Σ (k * qi / ri^2) * ri
Example (1): Proton in an electric field
- Given an electric field of (2 × 10^4 N/C), the force experienced by a proton is calculated using F = qoE
Example (2): Electric field at a point P.
- Find the electric field at point P with coordinates (0, 0.4) m due to two charges of opposite sign along the x-axis.
Electric Field - Continuous Charge Distribution
- Procedure for calculating the total electric field due to a continuous charge:
- Divide the charge distribution into small elements (Aq).
- Calculate the electric field due to one element at the point P.
- Sum the contributions of all charge elements.
- Formula For the individual charge element: ∆E=k∆q/r^2
Different cases of charge distribution
- Uniform volume charge density: ρ = Q/V (where Q is the total charge and V is the volume)
- Surface charge density: σ = Q/A (where Q is the total charge and A is the surface area)
- Linear charge density: λ = Q/L
Electric Field Lines
- The number of lines per unit area through a surface perpendicular to the lines is proportional to the magnitude of the electric field in that region.
- Field lines are closer together in stronger fields.
- The intensity of the electric field is higher where field lines are closer to each other.
- A positive charge generates field lines radiating outwards and negative charges radiate inward
Motion of Charged Particles in an Electric Field
- A positive charge accelerates in the direction of the electric field
- A negative charge accelerates in the opposite direction of the electric field
Motion of an Electric Dipole in a Uniform Electric Field
- The net force on a dipole in a uniform electric field is zero.
- A torque acts on the dipole, tending to align it with the field.
- Torque formula: τ = pEsinθ (where p is the dipole moment, E is the electric field, and θ is the angle between p and E).
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Description
Test your knowledge on electric fields and their properties in Physics II (PHY211). This quiz covers concepts such as the electric field vector, Coulomb's law, and how electric fields interact with charge. Perfect for students seeking to understand the foundational aspects of electric fields.
