A magnetic field exerts a torque τ on a round current-carrying loop of wire. Part A What will be the torque on this loop (in terms of τ) if its diameter is tripled?

C. A solenoid is an arrangement of many current loops placed together as shown below. The current through each loop is the same and is in the direction shown. Obtain or draw an enlargement of the figure. 1. At each of the labeled points, draw a vector to indicate the direction and magnitude of the magnetic field. Use the principle of superposition to determine your answer. 2. Sketch magnetic field lines on the enlargement. Describe the magnetic field near the center of the solenoid, Cross-sectional side view 3. How does the field of the solenoid at points A-E compare with that of a bar magnet (both inside and outside)? Which end of the solenoid corresponds to a north pole? Which end corresponds to a south pole? 4. How would the magnetic field at any point within the solenoid be affected by the following changes? Explain your reasoning in each case. The current through each coil of the solenoid is increased by a factor of two. The number of coils in each unit length of the solenoid is…

Ampere’s Law

A the moving rod has a resistance of 0.25 Ω and moves on rails 20.0 cm apart. The stationary U-shaped conductor has negligible resistance. When a force of 0.410 N is applied to the rod, it moves to the right at a constant speed of 1.50 m/s. What is the magnetic field?

What is the magnitude of the current in the coil and is it to the left or to the right?

A bar magnet is attached solidly to a frictionless surface and its length is aligned with the x axis. To the right of the first magnet a short distance away is a second bar magnet with its center placed on the x axis and its length perpendicular to the x axis. The second magnet is free to move. Once placed in position at rest, which best describes the initial motion of the second magnet? O The magnet will move away from the fixed magnet. The magnet will not move. The magnet will start to rotate. O The magnet will move toward the fixed magnet.

The net force on a current loop in a uniform magnetic field is zero. But what if B is not uniform? The figure (Figure 1) shows a square loop of wire that lies in the xy-plane. The loop has corners at (0, 0), (0, L), (L, 0), and (L, L) and carries a constant current I in the clockwise direction. The magnetic field has no x-component but has both y- and z- components: B = (Boz/L) j+ (Boy/L) Ê, where Bo is a positive constant. Figure (0, L) y (0, 0) (L, L) (L, 0) 1 of 1 X Part I Find the magnitude of the net magnetic force on the loop. Express your answer in terms of the variables Bo, L, and I. WG | ΑΣΦ F = Submit Part J O Find the direction of the net magnetic force on the loop. O O O Request Answer +x-direction -x-direction +y-direction -y-direction +z-direction -z-direction 0 Submit Request Answer X Roarson ?

The magnetic force exerted on a 1.2 m segment of straight wire is 1.5 N. The wire carries a current of 3.1 A in a region with a constant magnetic field of 0.51 T. You may want to review (Page 783). Part A What is the angle between the wire and the magnetic field? Express your answer using two significant figures. ΠΑΠ ΑΣΦ ? 0 =