A rectangular loop of wire of sides W = 0.26 m and = 0.76 m lying in xy plane carries a current of I = 5.5 A. If a uniform magnetic field of B= (2.7 T) î + (1.6 T)k is turned on, then what will be the initial magnitude of torque acting on the loop in units of in units of N-m? Answer: W L.

A rod of mass 0.720 kg and radius 6.00 cm rests on two parallel rails (see figure below) that are d = 12.0 cm apart and L = 45.0 cm long. The rod carries a current of I = 70.0 A in the direction shown and rolls along the rails without slipping. A uniform magnetic field of magnitude 0.260 T is directed perpendicular to the rod and the rails. If it starts from rest, what is the speed of the rod as it leaves the rails? (Assume that the rod is of uniform density.) m/s L tea

A rectangular loop with height h = 6.50 cm and width w = 4.50 cm is in a uniform magnetic field of magnitude B = 0.250 T, which points in the negative y-direction as shown in the figure below. The loop makes an angle of ? = 33.0° with the y- axis. The loop carries a current of magnitude i = 9.00 A in the direction indicated by the arrows. What is the magnitude of the torque on the loop around the z-axis?

Two coplanar and concentric circular loops of wire carry currents of I = 6.90 A and I2 = 2.00 A in opposite directions as in the figure below. (a) If r = 12.0 cm and r2 = 8.50 cm, what is the magnitude of the net magnetic field at the center of the two loops? μΤ (b) If ri = 12.0 cm and r2 = 8.50 cm, what is the direction of the net magnetic field at the center of the two loops? O out of the page o into the page toward the top of the page toward the bottom of the page (c) Let r, remain fixed at 12.0 cm and let r2 be a variable. Determine the value of r2 such that the net field at the center of the loop is zero. cm

A student makes a short electromagnet by winding 380 turns of wire around a wooden cylinder of diameter d = 2.1 cm. The coil is connected to a battery producing a current of 3.5 A in the wire. (a) What is the magnitude of the magnetic dipole moment of this device? (b) At what axial distance z >>d will the magnetic field have the magnitude 5.8 µT (approximately one-tenth that of Earth's magnetic field)?

A single-turn rectangular wire loop measures 6.00 cm wide by 10.0 cm long. The loop carries a current of 3.00 A. The loop is in a uniform magnetic field with B = 5.00 x 10-3 T. Taking torques about an axis, parallel to either side of the rectangular loop, that maximizes the torque, what is the magnitude of the torque exerted by the field on the loop if the direction of the magnetic field is described as the following? (a) parallel to the short sides of the loop N. m (b) parallel to the long sides of the loop N. m (c) perpendicular to the plane of the loop N. m

When the current through a circular loop is 13 A, the magnetic field at its center is 2.2 x 10-4 T. What is the radius of the loop? Hint Radius of the loop is cm.

A circular conductor with r=4cm is in uniform magnetic field B=5.0T that is pointing into the page. There is a clockwise current of 7.0A in the loop. What is the magnitude of torque on the loop along the y-axis which passes through the diameter of the loop?

A small bar magnet experiences a 1.50×10−2 N⋅mN⋅mtorque when the axis of the magnet is at 45.0∘∘ to a 9.00×10−2 TT magnetic field. What is the magnitude of its magnetic dipole moment?

A current of 30.0 mA is maintained in a single circular loop of 3.00 m circumference. A magnetic field of 0.850 T is directed parallel to the plane of the loop. (a) Calculate the magnetic moment of the loop. If you know the circumference of a circle, how do you find the area? mA · m2 (b) What is the magnitude of the torque exerted by the magnetic field on the loop? mN : m