The figure shows two concentric metal loops, each carrying a current. The larger loop carries a current of 8.0 A and has a radius of 0.060 m. The smaller loop has a radius of 0.040 m. What is the value of a current in the smaller loop that will result in zero total magnetic field at the center of the system? 8.0 A 0.040 m 0.060 m

A wire carries an I1 = 7.15-A current along the x-axis, and another wire carries an I2 = 5.20-A current along the y-axis, as shown in the figure below. What is the magnetic field at point P, located at x = 4.00 m, y = 3.00 m? magnitude      µT direction      ---Select--- +x −x +y −y into the page out of the page Two current-carrying wires lie along the axes in the x y coordinate plane. The wire along the x-axis carries current I1 in the +x-direction and lies on top of the wire along the y-axis, which carries current I2 in the +y-direction. Point P is in the first quadrant at (4.00, 3.00) m.

A circular coil of wire of 200 turns and diameter 5 cm carries a current of 4 A. It is placed in a magnetic field of 0.70 T with the plane of the coil making an angle of 30° with the magnetic field. What is the torque on the coil? 2.5 N·m 1.8 N.m 0.48 N.m 0.95 N·m

Two long parallel wires 20 cm apart carry currents of 5.0 A and 8.0 A in opposite directions. What is the magnitude of the net magnetic field midway between the wires? O 1.3 x 10-5 T 1.0 x 10-5 T 2.6 x 10-5 T 6.0 x 10-6 T 1.6 x 10-5 T

A proton travelling at a high velocity enters a 0.45 T magnetic field and travels in a circular path of radius 0.28 m as shown. A B=0.45 T X X X X X X X X X X X B What is the kinetic energy of the proton? And which path will the proton follow? A or B? x X X X X

Two conductors carrying currents of 6.0 A and 4.0 A are separated by 10.0 cm as shown. Determine the magnitude and direction of the magnetic field midway between the conductors. 10 cm 6.0 A 4.0 A 8.0x10-0 T into page 4.8x10- T repulsive O 4.0x10- T out of page O 4,0x10> T into page O 8.0x10-6 T out of page

A 25 cm section of a straight wire is inside a uniform magnetic field, as shown. The wire carries a 3.3 A current and is attached to a spring that has a spring constant of 11 N/m. What must be the strength of the magnetic field if it compresses the spring by 1.5 cm? 25 cm