A=29 B=39 C=139 D=12 Will be graded: Do for practice: 1. Two very long, straight, parallel wires each carry currents in=D/3 and i2= D/5 A, directed as shown in the figure. These wires pass through the vertices of a right isosceles triangle from R=C cm distance. a. Draw the FBD of magnetic fields at P? (20 points) b. Calculate magnetic field at P due to in, what is the direction? (10points) c. Calculate magnetic field at P due to iz, what is the direction? (10 points) d. What is total magnitude and direction of the magnetic field at point P?(15 points) e. If you project a proton with speed of B x10 m/s perpendicular to net magnetic field at P, what will be the magnetic force on the proton and what will be the acceleration? (20 points) Do for practice and earn (25 points) for completion: 2. A single infinitely long straight piece of wire carrying a current I is split and bent so that it includes two half circular loops of radius R, as shown in the Figure. If current In goes through the top loop and current 12 through the lower loop (with I = I1+12) and if 12 = (D/10) I, what is the magnitude of the magnetic field at the center of the circle in terms of I? Dr. Hetti PHY 156 3. A long straight wire carries a current of D/5 A and a circular loop of wire carries a current of B/5 Amp and has a radius of C cm. a. Find the magnitude and direction of the magnetic field at the center of the loop. b. If there is an electron moving towards the straight wire, v= B/5 m/s, what will be the magnitude and direction of magnetic force? 5. 6.a. A solenoid of length B cm and radius B/100 cm is comprised of C turns of wire. Determine the magnitude of the magnetic field at the center of the solenoid when it carries a current of D Amp. b. A solenoid carries current / as shown in the figure. If the observer could "see" the magnetic field inside the solenoid, how would it appear? c. The figure shows a circuit consisting of straight radial lengths and concentric circular arcs (half circles of radii r and 3r) and it carries the current I. What will be the magnetic field at the center in term of I and r