A square circuit measuring 1 cm on a side is placed in an ex…
A square circuit measuring 1 cm on a side is placed in an external magnetic field oriented perpendicular to the plane of the loop and out of the page, as shown below. The ammeter reads 2.0 A when the external magnetic field begins to change in magnitude at a steady rate from an initial value of 0.6 T at t=0. What is the magnitude and direction of this external magnetic field at t=2.0 sec?