Applications of Gauss’s Law

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Presentation transcript:

Applications of Gauss’s Law

When is Gauss’s Law Useful?

Sphere of Charge

Concentric Cavity Let’s say we have a sphere with a concentric cavity. The charge is not in the cavity only in the “donut shape” Draw a sphere big radius b, small radius a. If charge is positive then we expect the charge to be directed towards the centre. Everywhere inside the cavity E =0 If we take a Gaussian surface so b>r>a So if we’re outside the shell, it acts as a point charge at the centre of the shell.

Radius Dependent Charge Density

Homework Do the sheet please  Due in 4th February Read p676 to end of chapter