1)A square loop of wire with a side length 10.0 cm carries a current of

0.300 A. Use the Biot-Savart law to calculate the magnetic field at the center of the loop

square.

2)A very long sheet of a conductor located in the xy plane, as shown in

figure, it has a uniform current flowing in the y direction. Current density

is 1.5 A / cm. Use Ampre's law to calculate the direction and magnitude of the field

just above the center of the foil (not near either end).