Chapter 8.1, Problem 2cT

A wire loop moves from a region with no magnetic field into a region with a uniform magnetic fieldpointing into the page.

 
The loop is shown at two instants in time, $t=t_o\text{and}t=t_o+\Delta t$ .

1. Is the magnetic flux through the loop due to the external field positive, negative, or zero:
a. at $t=t_o$ ?
b. at $t=t_o+\Delta t$ ?
2. Is the change in flux due to the external field in the interval $\Delta t$ positive, negative, or zero?
3. Use Lenz’ law to determine whether the flux due to the induced current in the loop is positive, negative, or zero.
4. What is the direction of the current in the loop during this time interval?