If a 12 volt battery is placed across the three capacitor circuit in the previous problem, find the net amount of energy stored in the circuit once the capacitors have charged. 7. calculate the equivalent resistance of three resistors r, in series with the combination of r2 and r3 in parallel if ri=1092, rz=10012, and r3=3312 8. if a 12 volt battery is placed across the three resistor combination in the previous problem, find the currents through each resistor. 9. a carbon ion with a mass of 2e-26 kg enters a magnetic field moving perpendicular to the field at v=3x10 m/s. the charge on a ion is 1.6x10-1°c. if the radius of the ion's path is 16 cm, find the strength of the magnetic field. 10. a solenoid made from 600 turns of wire on a cylindrical form 2cm in diameter and 10 cm long has a current of 3 amps on it. find the strength of the magnetic field on the axis of the coil. 11. if the current in the solenoid described in the previous problem is interrupted and falls to zero in 0.001 seconds, find the voltage induced across the coil.