Arectangle of perfectly conducting wire having sides a and b, mass m and self-inductance l, moves with an initial velocity v0 in its plane directed along its longest side, from the region of zero magnetic field into a region with a field b0 which is uniform and perpendicular to the plane of the rectangle. derive the equation for the position of the wire as a function of time.

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to