84. The following appliances are operated in a 120.0 V circuit for a thirty-day month: Six 100.0 W light bulbs for 8.0 h/d a 10.0 n kettle for 10.0 min/d a bread machine drawing on 6.0 A for 1.0 h/d Calculate the electricity bill for the month at an average cost of 8.5 kWh . cents 85. Solve the following circuit: BAT2 120 V a) Find RT. HI b) Find Is. R5 R4 50 c) Find Iz. 45 0 d) Find V4. R1 R2 R3 20 0 60 Q 36 0 86. What is positive current flow? negative current flow? right hand and left hand helix rules? right and left hand straight conductor rules? 87. Draw the magnetic lines of force for each of the diagrams below: (a) 2 bar magnets (b) a current carrying conductor (c) current through a solenoid ( b ) (a) (c) S N - O N S 88. Draw the magnetic lines of force for each of the diagrams below: (a) 2 parallel wires with currents (b) a conductor near a U-shaped magnet (a) ( b ) S N