Question

Student's name Student's number 1. A current is produced a magnetic field of magnitude 5 HT at distance 0.04 m from a long. 2. Two parallel wires lie in the plane of the paper as shown in Fig. 1. Wire 1 carries a current 5 A 3. A condueting rod AB sliding with constant speed v-2 mis on conducting rails in a uniform straight wire? What is the distance from the axis of the wire where the magnitude of the magnetic field is 2 HT? and a wire 2 carries a current8 A in opposite direction. If the wires are 0.04 m apart, find the magnetic field at a point midway between the wires. magnetic field with B-0.15 T. The magnetic field is directed into the page as shown in Fig.2. The rod has a length 0.5 m and resistance 3 Ω, what is the current in the rod. Neglect a resistance if the rail. Fig.I + + + 14Fig.2 L-0.5 4 cm 5 A 8 A 4. In the circuit of Fig 3, the semicircle segments are of radii RI-20 cm and R3-10 cm. Find the magnetic field in point A, assuming a current I-10 A in the circuit. Fig.3 Fig.4 2 5 cm 30 A 10A 20 A 5. (10 points) Consider the three long, straight parallel wires shown in Fig. 4. Find the magnetic field in the midway between of wire 2 and 3.

Answer 1

B = mu_0 I/2 pi d B_1 d_1 = B_2 d_2 5 times 0.04 = 2 times d_2 d_2 = 0.1 m B = mu_0(I_1 + I_2)/2 pi times (d/2) = 4 pi times 10^-7 times 13/2 pi times 0.02 B = 1.3 times 10^-4 T into the page.