For 10 points, name this French physicist whose namesake unit measures current.
Lord Kelvin constructed numerous balance apparatuses named for this man, who invented the astatic needle. One law named for this man describes the work done in moving a monopole around a closed path, and another relating magnetic field strength to distance and electric current is a special case of the Biot-Savart Law. A flow of one coulomb per second is equal to his namesake unit, which measures a quantity often symbolized by a capital I. For 10 points, name this French physicist whose namesake unit measures current.
Lord Kelvin constructed numerous balance apparatuses named for this man, who invented the astatic needle.
André Marie {Ampère}