C$.$ A wire $k$ moves $fr$ region $w$ magnetic into a res with a ur magnetic pointing the page The loop is shown at two instants in time, $t=t_{}$ and $t=t_{}+t.$ Is the magnetic flux through the loop due to the extemal field positive, negative, or zero: a$.$ at $t=t_o?$ b$.$ at $t=t_o+t?$ Is the change in flux due to the extemal field in the interval $t$ positive, negative, or zero? Use Lenz' law to determine whether the flux due to the induced current in the loop is positive, negative, or zero. What is the direction of the current in the loop during this time interval? D$.$ At two la instants, and