The current I in a long, straight wire is constant and is directed toward the right. Conducting loops A, B, C, and D are moving, in the directions shown, near the wire. a)  Is the direction of the induced current clockwise or counterclockwise, or is the induced current zero for loop D? Briefly explain. b) What is the direction of the net force that the wire exerts on the loop D? (No explanation is needed.) c) Is the direction of the induced current clockwise or counterclockwise, or is the induced current zero for loop C? Briefly explain.

X R The figure above shows two parallel loops of wire having a common axis. The smaller loop (radius r) is above the larger loop (radius R) by a distance x >> R. Consequently, the magnetic field due to the counterclockwise current i in the larger loop is nearly constant throughout the smaller loop. Suppose that x is increasing at the constant rate dx/dt = V. NOTE: Express your answers to parts (a) and (b) in terms of the given variables. (a) Find an expression for the magnetic flux through the area of the smaller loop as a function of x. ÞB(x) = (b) Determine the magnitude of the induced emf in the smaller loop. E = (c) Determine the direction of the current in the small loop. Choose one ▾

A current loop in a motor has an area of 1.95 cm² . It carries a 240 mA current in a uniform field of 0.62 T. 1 Part A What is the magnitude of the maximum torque on the current loop? Express your answer with the appropriate units. T= BHA μÅ S Value → C Units ?

I There is a straight, infinite current is directed towards the right and a small loop of wire (with the normal to the plane of the loop perpendicular to the current) located as shown. Which of the following would result in no current being induced in the loop? Select one or more: D a. turn off the current o b. move the loop towards the wire D c. move the loop away from the wire o d. move the loop towards the right

Two loops carry equal currents I in the same direction. The loops are held in the positions shown in the figure and are then released. Which one of the following statements correctly describes the subsequent behavior of the loops? O The loops remain in the positions shown. O The top loop moves to the right; the bottom loop moves to the right. O The loops attract each other. Both loops move to the left. O The loops repel each other. C

The component of the external magnetic field along the central axis of a 69 turn circular coil of radius 47.0 cm decreases from 2.90 T to 0.700 T in 2.10 s. If the resistance of the coil is R = 3.00 §, what is the magnitude of the induced current in the coil? magnitude: What is the direction of the current if the axial component of the field points away from the viewer? counter-clockwise clockwise A

c) Indicate the magnetic poles of the coil, and draw the induced magnetic field and the direction of the induced current. V

a very long wire in three different ways as shown in the figures. 1 2 The radius of the circular loop is R = 31.3 cm and the wire carries the same electric current I = 18.1 A in all three cases. In the first and in the second case the plane of the circle is parallel to the straight wire segments, in the third case the plane of the circle is perpendicular to the straight segments. The straight segments are very long in all three cases in both directions. What is the size of the magnetic field at the center of the circle in the first case? Submit Answer Tries 0/99 What is the size of the magnetic field at the center of the circle in the second case? Submit Answer Tries 0/99 What is the size of the magnetic field at the center of the circle in the third case? Submit Answer Tries 0/99

15b

The horizontal loop in the figure is placed in an external magnetic field B pointing downwards. If the external field B is increasing with time, then what is the direction of the induced current in the loop as viewed from above? t B Choose your answer from: Clockwise / Counterclockwise / No induced current