3. A loop is in a magnetic eld B as shown. The magnitude of B changes with time as shown in the figure. The loop has a resistance of 10 9. Find the magnitude and direction of the induced current in the loop at t=5.8 s. 80:10-31\") I: x x x \"lo\".xMcm 4. The current in the RL circuit shown below reaches half its maximum value in 1.75 ms after the switch 51 is closed. Determine the resistance of the resistor if L=250mH. Sketch the current as a function of time