3 Questions
What is the surface charge density of a conductor with a charge of 5C and an area of 10m^2?
0.5 C/m^2
What is the expression for the electric potential energy placed in a uniform electric field?
Electric potential energy (U) = qV, where q is the charge and V is the electric potential.
At what point on the line joining two point charges (4mu C and 1mu C) separated by a distance of 2m in air, is the net electric field of the system zero?
At a point 1 meter from the 4mu C charge and 3 meters from the 1mu C charge.
Study Notes
Electric Field and Potential
- Surface charge density of a conductor is given by the formula: σ = Q / A, where σ is the surface charge density, Q is the charge, and A is the area of the conductor.
- For a conductor with a charge of 5C and an area of 10m^2, the surface charge density is σ = 5C / 10m^2 = 0.5 C/m^2.
- Electric potential energy (U) in a uniform electric field (E) is given by the expression: U = qEh, where q is the charge, and h is the distance from the reference point.
- The net electric field is zero at a point on the line joining two point charges, where the electric field due to each charge is equal in magnitude but opposite in direction.
- For two point charges of 4μC and 1μC, separated by a distance of 2m in air, the net electric field is zero at a point on the line joining the charges, where the electric field due to the 4μC charge is equal in magnitude to the electric field due to the 1μC charge.
Test your knowledge of electricity and electric fields with these questions on surface charge density, electric potential energy, and net electric field due to point charges.
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