Question

1. (20 pts.). In the circuit shown in the diagram R 10 m,Ra 0.02 , R 01 , Rs -30 mt Rs 40 min. Rs 50 min. R7 60 min, and ε 100 V. A) (10 pts.) find the equivalent resistance for this circuit; B) (5 pts.) find the voltage and the current for the resistor R C) (5 pts.) find the electric power in the resistor Rr. 2. (20 pts.). In the cir rcuit shown in the diagram, find the resistance Ri, current through it and the unknown emf e2. Hee ei : 30 V e-100 V, R 5 Ω, R3 R4 4 n, Rs i n, the current through R2 reads 12-5 A and the current through Rs is 14-5 A correspondingly 3. (10 pts.). Three equal bulbs, each with resistance r 25 12 are connected the first time in series and the second time in parallel as shown in the diagram. Compare the total electric power for the both cases. In the both cases voltage V 100 V is applied. 4. (20 pts). For the system shown in the diagram find magnetic field in the point A. Current I is the same for all wires and is equal to 2-10-2A. The radii are Ri-5 cm and R2 = 2 cm. 5. (20 pts.). Four long straight wires with currents I 60 mA, l2 3x10-2 A, 1s 40 mA and 142x102 A are located in one plane as shown in the diagram. Distance between any two neighboring wires is d 2.10-2 m, length of each wire is L = 10 m, what is the magnetic field in each point of the wire 3 due to the wires i, 2 and 4. 6. (20 pts.) For the problem 6 find net force exerted on the wire 2 by all the other wires 1, 3 and 4.

Answer 1

jo V P7 20 Fquivalent Resistence 0 6142 R7 o.ol+ 0.014g.to,o 6 20:19--4-29 22:56 Equivalent Resistance20

Voltage f current Total urrent hnym Ri O2- Since R, İS connec. fed nest grund , tt will com Vol tage.d Vf= 11-7757V cJ Electic prwer in R Current through R77S7 A Pouer 83200.26 Watts 2019-4-29 22:57