Question

Study the circuit below:

1. Determine the combined resistance of the circuit.
2. Determine the current flowing in the circuit. 

Answer 1

1. Determine the combined resistance of the circuit. 
   • For series 1.5 + 3 = 4.5Ω = ⁹/₂
     R_T = 9/4 Ω = 2.25Ω
     Parallel ¹/_RT = 2/9 + 2/9 = 4/9 
2. Determine the current flowing in the circuit. 
   • The magnetic field due to the magnet and that due to current interact producing a resistant force on the wire upwards.