7. Electric Fields.md
2024-4-11|2024-4-12
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Section 18.1: Electric fields and field lines
- Definition Dictation: Define an electric field and describe it as a field of force. Answer:
- Formula Dictation and Application: Recall the formula that relates the force on a charge in an electric field and use it to calculate the force on a charge of C in an electric field with a strength of . Answer:
- Representation: How are electric field lines used to represent an electric field, and what rules must be followed in their representation? Answer:
Section 18.2: Uniform electric fields
- Formula Dictation and Application: Recall the formula that relates the electric field strength to the potential difference and separation between charged parallel plates and use it to find the field strength if the potential difference is and the plate separation is . Answer:
- Effect on Charged Particles: Describe the motion of a positively charged particle when it enters a uniform electric field perpendicular to the field lines, and provide the formula used to calculate the force on the particle. Answer:
Section 18.3: Electric force between point charges
- Conceptual Understanding: Explain why, for a point outside a spherical conductor, the charge on the sphere may be considered to be at its centre. Answer:
- Formula Dictation and Application: Recall Coulomb's law and use it to calculate the force between two point charges of C and C separated by a distance of m in free space. (Assume the value of to be C²/Nm² for calculation simplicity.) Answer:
Section 18.4: Electric field of a point charge
- Formula Dictation and Application: Recall the formula for the electric field strength due to a point charge and calculate the field strength at a distance of m from a point charge of C. Answer:
Section 18.5: Electric potential
- Definition Dictation: Define electric potential at a point. Answer:
- Conceptual Understanding: Explain why the electric field at a point is equal to the negative of the potential gradient at that point. Answer:
- Formula Dictation and Application: Use the formula for the electric potential in the field due to a point charge to calculate the potential at a distance of m from a point charge of C. Answer:
- Application of Electric Potential Energy: Calculate the electric potential energy of two point charges of C and C separated by a distance of m. Answer:
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