1. A circular loop has radius R and carries current I2 in a clockwise direction. The center of the loop is a distance D above an infinitely long, straight wire carrying a current I1.

A wire with current i = 2.47 A is shown in the figure. Two semi-infinite straight sections, both tangent to the same circle with radius 4.51 cm, are connected by a circular arc that has a central angle 0 and runs along the circumference of the circle. The connecting arc and the two straight sections all lie in the same plane. If B = 0 at the center of the circle, what is 0? 2Connecting arc Number i Units

L R = 5.00 Q X Xix x 1 |X X X X R P = FexV =8.50 J/s Fext W X xx x X X X X X X X X A rectangular wire loop of length L, width w, is pulled out of a constant, uniform magnetic field with constant velocity v. The loop has a resistance R. The magnetic field of magnitude B, points into the plane of the paper, and is confined to the rectangular region shown above. Work must be done on the loop at the rate of P, to move it through the magnetic field at constant velocity. Find the magnitude of the emf, & and the current I for the loop.

50. A straight, stiff wire of length 1.00 m and T=0 T= 0 mass 25 g is sus- pended in a magnetic field B=0.75 T. The wire is connected to -1.00 m an emf. How much current must flow in the wire and in what direction so that the wire is sus- pended and the tension in the supporting wires is zero?

6. Three long, straight wires are mounted on the vertices of an equilateral triangle as shown in the figure. The wires carry currents of I1 = 2.00 A, I2 = 5.000 A, and I3 = 4.50 A. Each side of the triangle has a length of 42.0 cm, and the point (C) is located half way between (I1) and (I3) along one of the sides. Find the magnitude of the magnetic field at point (C). oof19 oof19 oon oof19 oof19 oofl 18 of19 0of19 o0f19 oof19 oof19 19 0of19 o0f

Problem 12: Part (a)  What is the ratio I1 / I2 that gives zero field strength at the center of the loop, in terms of the variables given in the problem statement?  I1/I2 = ______

The drawing shows four insulated wires overlapping one another, forming a square with 0.050-m sides. All four wires are much longer than the sides of the square. The net magnetic field at the center of the square is 86 µT directed into the drawing. Calculate the current I. Number i 2.7 A 3.9 A 7.3 A Units

A cylindrical solenoid of length 0.711 m and radius 0.0334 m which carries a current of i = 4.06 A has a total stored energy of UB = 4460 J. How many turns per unit length does the solenoid have? i m-1