You would like to store 7.9 J of energy in the magnetic field of a solenoid. The solenoid has 570 circular turns of diameter 7.4 cm distributed uniformly along its 24 cm length. Part A How much current is needed? Express your answer using two significant figures. I= 26.26 VE ΑΣΦ Submit Previous Answers Request Answer Part B X Incorrect; Try Again; 29 attempts remaining B B= 0.0783 What is the magnitude of the magnetic field inside the solenoid? Express your answer using two significant figures. ΑΣΦ Part C Submit Previous Answers Request Answer UB= ? P * Incorrect; Try Again; 29 attempts remaining ? A What is the energy density (energy/volume) inside the solenoid? Express your answer using two significant figures. VE ΑΣΦ PRZ ? T kJ/m³

Point A in (Figure 1) is 6.0 mm from the wire. Assume that the wire is very long and that all other wires are too far away to contribute to the magnetic field. Figure ww 20 Ω 60 V + 100 Ω . A < 30 Ω 1 of 1 www Part A What is the magnetic field strength at point A? Express your answer with the appropriate units. BA= Submit 2² Provide Feedback μА Value Request Answer Units ?

A 0.56 m copper rod with a mass of 5.00x10-2 kg carries a current of 10 A in the positive x direction. Let upward be the positive y direction. Part A What is the magnitude of the minimum magnetic field needed to levitate the rod? Express your answer using two significant figures. Hνα ΑΣφ B = T

A 7.0-cm -long wire is pulled along a U-shaped conducting rail in a perpendicular magnetic field. The total resistance of the wire and rail is 0.30 N. Pulling the wire with a force of 1.3 N causes 4.1 W of power to be dissipated in the circuit. Part A What is the speed of the wire when pulled with 1.3 N ? Express your answer in meters per second. Π ΑΣΦ V = Submit Part B What is the strength of the magnetic field? Express your answer in tesla. —| ΑΣΦ B = Request Answer Submit Request Answer ? ? m/s T

In the figure, a long straight wire carries a current i = 28.6 A and a rectangular loop carries current iz = 27.7 A. Take a = 0.852 cm, b = 8.41 cm, and L = 26.2 cm. What is the magnitude of the net force on the loop due to i1? a L. I. Number i Units

A current I is passed through a wire. A second wire of length L is moving perpendicular to the magnetic field generated by the first wire (see sketch below) with velocity v at a distance d. Consider the magnetic field B to be constant over the range / of motion of the second wire (i.e. d > 1). You need to calculate the potential generated between the ends of the second wire. Please select statements that would describe your approach to solving the problem. Wire 1 Wire 2 d a. Use an expression for the electromotive force (EMF) induced by the magnetic field. b. Use the expression for the magnetic force between two current-carrying wires. C. Use the expression for the magnetic field of a current-carrying wire.

A wire with a length of 3.5 m and a mass of 0.74 kg is in a region of space with a magnetic field of 0.76 T. Part A What is the minimum current needed to levitate the wire? Express your answer using two significant figures. νΠ ΑΣφ I = A

The earth's magnetic field, with a magnetic dipole moment of 8.0 x 1022 A m², is generated by currents within the molten iron of the earth's outer core. Suppose we model the core current as a 3000-km-diameter current loop made from a 1000-km-diameter "wire." The loop diameter is measured from the centers of this very fat wire. ▼ Part B What is the current density J in the current loop? Express your answer to two significant figures and include the appropriate units. J = Submit Part C Лоор Jwire μA Value Submit Request Answer To decide whether this is a large or a small current density, find the ratio of the current density J in the current loop to the current density of a 3.0 A current in a 1.0-mm-diameter wire. Express your answer using two significant figures. 17 ΑΣΦ VO Units Request Answer ? ?

A 10 cm x 10 cm square is bent at a 90° angle. A uniform 5.70x10-2 T magnetic field points downward at a 45° angle.(Figure 1) You may want to review (Pages 843-845). For help with math skills, you may want to review: The Vector Dot Product Figure 45% 5 cm 18 B 1 1 of 1 5 cm 10 cm Part A What is the magnetic flux through the loop? Express your answer with the appropriate units. Value Submit HÅ Provide Feedback Units Request Answer □】?

A circular coil of wire 9.00 cm in diameter has 14.0 turns and carries a current of 2.70 A. The coil is in a region where the magnetic field is 0.570 T. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Torque on a circular coil. Part A What orientation of the coil gives the maximum torque on the coil ? Express your answer as an angle in degrees between the field and the normal to the plane of the loop. o= Submit Part B Tmax = What is this maximum torque in part (A) ? Express your answer in newton-meters. Submit Part C ΑΣΦ Request Answer ز Submit ΑΣΦ Request Answer For what orientation of the coil is the magnitude of the torque 71.0 % of the maximum found in part (B)? Express your answer as an angle in degrees between the field and the normal to the plane of the loop. ? - ΑΣΦ Request Answer N m ?