If charge is continuously distributed over the surface of an object, which charge density is used to represent it?
Answer and explanation
Correct answer: sigma
For charge distributed over a surface, the relevant density is surface charge density, sigma = dQ/dA. The differential area dA shows that charge is measured per unit area. By contrast, lambda = dQ/dl is linear density for a wire, rho = dQ/dV is volume density for a three-dimensional body, and Q is total charge rather than a density. Therefore option B is correct.
Frequently asked questions
What is the correct answer to this question?
sigma
Why is this the correct answer?
For charge distributed over a surface, the relevant density is surface charge density, sigma = dQ/dA. The differential area dA shows that charge is measured per unit area. By contrast, lambda = dQ/dl is linear density for a wire, rho = dQ/dV is volume density for a three-dimensional body, and Q is total charge rather than a density. Therefore option B is correct.
Which subject and chapter does this question cover?
This is a Class 12 Physics question. Chapter: Chapter1: Electric Charges and Fields. Topic: Continuous Charge Distribution.
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