Which of the following statements is false? a A coil of wire carrying an electric current can produce a magnetic field. b A coil of wire carrying an electric current is an electromagnet. c A wire carrying an electric current can affect a compass. d A coil of wire carrying an electric current is a permanent magnet.

Certain experiments must be performed in the absence of any magnetic fields. Suppose such an experiment is located at the center of a large solenoid oriented so that a current of I = 3.40 A produces a magnetic field that exactly cancels Earth's 4.50 x 10-5 T magnetic field. Find the solenoid's number of turns per meter. HINT turns/m

A thin, 1.08 m long copper rod has a mass of 36.3 g. What is the minimum current in the rod that will cause it to float in a magnetic field of 2.94 T? Answer in units of A.

The figure below shows a circuit with a rod suspended in a magnetic field. The Power Supply provides current in the circuit. The magnetic field pointing into the page has a magnitude of 4.59T. The current flowing in the rod is such that there is no tension in the supporting wires. The mass of the rod is 0.0436 Kg and the length of the rod is L = 1.0 m. a) What is the direction of the current as it passes through the rod? Choose from: To the left/ To the right / Out of the page / Into the page b) What is the current passing through the rod? Power supply No tension L

A wire carries a 5.78-A current along the x axis, and another wire carries a 2.18-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? 0.138 Use the expression for the magnetic field around a current-carrying wire to find the magnitude and direction of the magnetic field contribution from each of the two currents. UT magnitude direction out of the page y (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

A square loop of wire with sides of 20.0cm is half in and half out of a uniform magnetic field which points out of the page as shown. The loop is moving with a speed of 3.00m/s and the strength of the magnetic field is 0.100Tesla. The total resistance of the loop is 4.00Ω. Find the magnitude and directionof the current if the loop is moving in the following directions. a.in the +x direction b.in the -x direction c.in the +y direction d.in the -y direction

A 0.30 m long wire with a mass of 0.008 kg carries 1.5 A and is placed in a magnetic field The magnetic force on the wire is sufficient to support the wire's weight. Assume all alignments are perpendicular. What is the strength of the magnetic field? 0.0353 T 5.74 T 0.174 T 0.0157 T

6. A wire with length L carries a constant current of I in the +y direction. See figure. It is in a region of space where the magnetic field is given by: B=-B, y (4) L positive constant. If the magnitude of the magnetic force on the wire is F, find Bo. The knowns are F, I and L. Start with dF = Idl x B I i, where Bo is a thickness = dy I L

A wire carries an I1 = 7.45-A current along the x-axis, and another wire carries an I2 = 5.00-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      Use the expression for the magnetic field around a current-carrying wire to find the magnitude and direction of the magnetic field contribution from each of the two currents. µT direction              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.