Phys 1215, Second Test Practice P1: Induction. Indicate the direction of the induced current in the loop in each of the following cases: P2: Find the magnetic field at point “P” produced by the two long straight current carrying wires shown in the figure. Make sure to answer with magnitude and direction. P3: Find the magnetic force on a proton coming towards our planet at a speed of 4x105m/s if the magnetic field of the Earth is 1.5x10-5T at that point and it is perpendicular to the velocity of the proton (as shown in the figure). Answer with magnitude and indicate the direction of the force in the figure below. P4: A circular loop of wire of diameter 1.05m is located in a region where the magnetic field is 0.225T and perpendicular to the plane of the loop. You pull the wire reducing the diameter of the loop to 0.95m in 5 seconds. Find the average emf produced by this change. P6: A series RL circuit has R of 25 Ω, L of 12 H. The source voltage is 8.0 V. Find the maximum current in the circuit after the switch is closed. Find the time constant of the RL circuit. Find the current in the circuit 1.2 seconds after the switch is closed. P7) Find the power delivered by the voltage source. The voltage is given in RMS voltage. Find the voltage across resistor, R1. P8) Write down the equations you would use to solve for the currents in each branch of the circuit. Draw the directions of the current on the diagram.