Ten questions. The result tells you which lessons you may skip.
A metal block rests in a uniform electric field, and its charges have stopped moving. The field inside the metal is
A solid copper ball is given \(+5\,\mu\text{C}\). Where does the charge settle?
The surface charge density at a point on a conductor is \(8.85 \times 10^{-9}\,\text{C/m}^2\). With \(\varepsilon_0\) \(= 8.85 \times 10^{-12}\,\text{C}^2/(\text{N m}^2)\), the field just outside is
A metal sphere of radius \(10\,\text{cm}\) carries \(2\,\mu\text{C}\). With \(k\) \(= 9 \times 10^9\,\text{N m}^2/\text{C}^2\), the potential at its centre is
Two metal spheres of radii \(10\,\text{cm}\) and \(20\,\text{cm}\) are at the same potential. The ratio of their surface charge densities, small to large, is
A charge of \(+2\,\mu\text{C}\) sits in the cavity of a neutral metal shell. The charge on the cavity wall is
A charged rod is brought near a closed, empty metal box. The steady field inside the box
Shell A (\(10\,\text{cm}\), \(+2\,\mu\text{C}\)) sits inside shell B (\(20\,\text{cm}\), \(+4\,\mu\text{C}\)). The charge on the outer surface of B is
In the same pair, shell B is earthed. Afterwards B carries
The field just outside a charged conductor is \(10^6\,\text{N/C}\). The outward pressure on its surface is about