below multiple choice answer,

1. in the picture below, there are two parallel long wires that carry current, with the direction of the current going in (cross sign ) . Each wire carries a current of 4A. What is the value of the net magnetic field at the point S? 3m S 4m 3m A. 0.384 x 10-#T B. 0.256 x 10-# T C. 0.512 x 10#T D. 0.192 x 10#T 2. In the figure below, a charged ball with hole is charge unevenly distributed. If the volume value k is p = -, where R is the distance from the center of the hollow ball, with a value of k = 3pCm . What is the net charge on the hollow ball? 16cm A. 23 06 B. 38 0R C. 52 06 D. 65 05 3. In the circuit below, how much current and where is it going in battery 2? as known Ri = 10, Rx= 20, 6, = 2V, 6 =6 =4V A. 0.33A, downward B. 0.33A, upward C. 0.83 A, upward D. 0.83 A downward4. In the circuit below, it is known that Ci = 1pF, Co= 2 UF , Ca = BUF, Cq = LIF which is connected to a 12 V battery. Initially these four capacitors were uncharged. If Si and 52 are connected, what is the charge on capacitor 2 (Co) G A. 10 JC B. 16 UC C. 24 UC 30 UC 5. In the figure below, circular wire is in the shape of square with side length of 2m. In this wire, a 20V emf battery is installed. Half of the wire is in uniform magnetic field whose magnitude varies according to the equation B= 0.80t-0.12, where B is in Tesla and t is in seconds. When the magnetic field B changes with time, what is the net emf value and what is the direction of the net current flowing in the wire? A. emf net = 18.4 V, the direction of the induced current is counterclockwise B. emf net = 18.4 V, the direction of the induced current is clockwise C. emf net = 21.6 V, the direction of the induced current is counterclockwise D. emf net = 21.6 V, the direction of the induced current is clockwise 6. What is the value of the electric magnetic field at point P in the figure below? (it is known that R = 6 cm, L = 14.5 cm, and Q = 7.81 8R A. 52.2 N/C B. 33.0 N/C C. 20.8 N/C D. 12.4 N/C7. a power source supplies 100V to the main coil of a transformer having 50 turns of coil. What is the voltage from the secondary coil? A. 1.5 x 10#v B. 2.5 x 104 C. 4.0 x 10 D. 1.0 x 10 3. An optical fiber as shown in the picture below, where the core is made of plastic material and refractive index n, = 1.58, covered by a protective plastic layer with refractive index no = 1.53. Rays that enter an angle e will experience a total internal reflection at point A which is on the boundary between the plastic core-plastic wrap. How much value 8 so that there is total internal reflection? A. 23.20 B. 33.20 C. 45.00 A. 51.60 9 + + + + + B + + + + + two large charged plates are parallel as shown in the figure (cross section). if the charge density of each plate is o = 1.77 x 102 cm what is the value of the electric field from point A? A. 2x 1013 N/C B. 4 x 101' N/C C. 7x 1013 N/C D. 10 x 10 # N/C