Determine the magnetic flux through a square loop of side a if one side is parallel to, and a distance b from a straight wire that carries a current I.

1. If the loop is pulled away from the wire at speed v, what emf is induced in it?

2. Which way does the induced current flow through the loop?

3. How does the emf vary in time, if the initial position of the left vertical side was b0 at time t=0?

4. Determine the force F required to pull the loop away from the line of current.