A metal bar with length LL, mass mm, and resistance RR is placed on frictionless metal rails that are inclined at an angle & above the horizontal. The rails have negligible resistance. A uniform magnetic field of magnitude BB is directed downward in the figure (Figure 1). The bar is released from rest and slides down the rails. Is the direction of the current induced in the bar from a to bor from b to a?

The accompanying figure shows a metal disk of inner radius r1 and other radius r2 rotating at an angular velocity while in a uniform magnetic field directed parallel to the rotational axis. The brush leads of voltmeter are connected to the dark's inner and outer surfaces as shown. What is the reading of the voltmeter ?

12.7 Check Your Understanding What is the ratio of the magnetic field produced from using a finite formula over the infinite approximation for an angle of (a) 85°? (b) 89°? The solenoid has 1000 mins in 50 cm with a current of 1.0 A flowing through the coils

How is the percentage change in the strength of the magnetic field across the face of the toroid related to the percentage change in the radial distance from the axis of the toroid?

Check Your Understanding The wire loop forms a full circle of radius R and current I. What is the magnitude of the magnetic field at the center?

Two flat, circular coils, each with a radius R and wound with JV turns, ace mounted along the same axis so that they are parallel a distance d apart. What is the magnetic field at the midpoint of the common axis if a current I flows in the same direction through each coil?

A long-rigid wire lies along the x-axis and cairns a current of 2.5 A in the positive x-direction. Around the wire is the magnetic field B=2.0i+5.0x2j, With x in meters and B in millitesla. Calculate the magnetic force on the segment of wire between x=2.0m and x=4.0m .

A charge of 4.0C .s distributed uniformly around a thin ring of insulating material. The ring has a radius of 0.20 m and rotates at 2.0104 rev/min around die axis that passes through its center and is perpendicular to the plane of the ring. What is the magnetic field at the center of the ring?

What is the direction of the magnetic field that produces the magnetic force on a positive charge as shown in each of the three cases, assuming B is perpendicular to v?

Check Your Understanding Shown below is a rod of length l that is rotated counterclockwise around the axis through O by the torque due to mg . Assuming that the rod is in a uniform magnetic field B , what is the emf induced between the ends of the rod when its angular velocity is ? Which end of the rod is at a higher potential?