Problem 28.1DQ: A topic of current interest in physics research is the search (thus far unsuccessful) for an... Problem 28.2DQ: Streams of charged particles emitted from the sun during periods of solar activity create a... Problem 28.3DQ: The text discussed the magnetic field of an infinitely long, straight conductor carrying a current.... Problem 28.4DQ Problem 28.5DQ: Pairs of conductors carrying current into or out of the power-supply components of electronic... Problem 28.6DQ: Suppose you have three long, parallel wires arranged so that in cross section they are at the... Problem 28.7DQ: In deriving the force on one of the long, current-carrying conductors in Section 28.4, why did we... Problem 28.8DQ: Two concentric, coplanar, circular loops of wire of different diameter carry currents in the same... Problem 28.9DQ: A current was sent through a helical coil spring. The spring contracted, as though it had been... Problem 28.10DQ Problem 28.11DQ Problem 28.12DQ: Two very long, parallel wires carry equal currents in opposite directions. (a) Is there any place... Problem 28.13DQ: In the circuit shown in Fig. Q28.13, when switch S is suddenly closed, the wire L is pulled toward... Problem 28.14DQ: A metal ring carries a current that causes a magnetic field B0 at the center of the ring and a field... Problem 28.15DQ Problem 28.16DQ Problem 28.17DQ: If a magnet is suspended over a container of liquid air, it attracts droplets to its poles. The... Problem 28.18DQ Problem 28.19DQ Problem 28.20DQ: A cylinder of iron is placed so that it is free to rotate around its axis. Initially the cylinder is... Problem 28.1E Problem 28.2E Problem 28.3E: An electron moves at 0.100c as shown in Fig. E28.3. Find the magnitude and direction of the magnetic... Problem 28.4E: An alpha particle (charge +2e) and an electron move in opposite directions from the same point, each... Problem 28.5E: A 4.80-C charge is moving at a constant speed of 6.80 105 m/s in the +x-direction relative to a... Problem 28.6E: Positive point charges q = +8.00 C and q' = +3.00 C are moving relative to an observer at point P,... Problem 28.7E: A negative charge q = 3.60 106 C is located at the origin and has velocity v = (7.50 104 m/s) +... Problem 28.8E: An electron and a proton are each moving at 735 km/s in perpendicular paths as shown in Fig. E28.8.... Problem 28.9E: A straight wire carries a 10.0-A current (Fig. E28.9). ABCD is a rectangle with point D in the... Problem 28.10E: A short current element dl = (0.500 mm) carries a current of 5.40 A in the same direction as dl.... Problem 28.11E: A long, straight wire lies along the z-axis and carries a 4.00-A current in the +z-direction. Find... Problem 28.12E: Two parallel wires are 5.00 cm apart and carry currents in opposite directions, as shown in Fig.... Problem 28.13E Problem 28.14E: A square wire loop 10.0 cm on each side carries a clockwise current of 8.00 A. Find the magnitude... Problem 28.15E: The Magnetic Field from a Lightning Bolt. Lightning bolts can carry currents up to approximately 20... Problem 28.16E: A very long, straight horizontal wire carries a current such that 8.20 1018 electrons per second... Problem 28.17E Problem 28.18E: BIO Bacteria Navigation. Certain bacteria (such as Aquaspirillum magnetotacticum) lend to swim... Problem 28.19E: (a) How large a current would a very long, straight wire have to carry so that the magnetic field... Problem 28.20E: Two long, straight wires, one above the other, are separated by a distance 2a and are parallel to... Problem 28.21E: A long, straight wire lies along the y-axis and carries a current I = 8.00 A in the y-direction... Problem 28.22E: BIO Transmission Lines and Health. Currents in dc transmission lines can be 100 A or higher. Sonic... Problem 28.23E: Two long, straight, parallel wires, 10.0 cm apart, carry equal 4.00-A currents in the same... Problem 28.24E: A rectangular loop with dimensions 4.20 cm by 9.50 cm carries current I. The current in the loop... Problem 28.25E: Four, long, parallel power lines each carry 100-A currents. A cross-sectional diagram of these lines... Problem 28.26E: Four very long, current-carrying wires in the same plane intersect to form a square 40.0 cm on each... Problem 28.27E: Two very long insulated wires perpendicular to each other in the same plane carry currents as shown... Problem 28.28E: Three very long parallel wires each carry current I in the directions shown in Fig. E28.28. If the... Problem 28.29E: Two long, parallel wires arc separated by a distance of 0.400 m (Fig. E28.29). The currents I1 and... Problem 28.30E Problem 28.31E: Lamp Cord Wires. The wires in a household lamp cord are typically 3.0 mm apart center to center and... Problem 28.32E Problem 28.33E: BIO Currents in the Brain. The magnetic field around the head has been measured to be approximately... Problem 28.34E: Calculate the magnitude and direction of the magnetic field at point P due to the current in the... Problem 28.35E: Calculate the magnitude of the magnetic field at point P of Fig. E28.35 in terms of R, I1 and I2.... Problem 28.36E: A closely wound, circular coil with radius 2.40 cm has 800 turns. (a) What must the current in the... Problem 28.37E: A single circular current loop 10.0 cm in diameter carries a 2.00-A current. (a) What is the... Problem 28.38E: A closely wound coil has a radius of 6.00 cm and carries a current of 2.50 A. How many turns must it... Problem 28.39E: Two concentric circular loops of wire lie on a tabletop, one inside the other. The inner wire has a... Problem 28.40E: Figure E28.40 shows, in cross section, several conductors that carry currents through the plane of... Problem 28.41E: A closed curve encircles several conductors. The line integral Bdl around this curve is 3.83 104 T ... Problem 28.42E: As a new electrical technician, you are designing a large solenoid to produce a uniform 0.150-T... Problem 28.43E Problem 28.44E Problem 28.45E: A solenoid that is 35 cm long and contains 450 circular coils 2.0 cm in diameter carries a 1.75-A... Problem 28.46E: A 15.0-cm-long solenoid with radius 0.750 cm is closely wound with 600 turns of wire. The current in... Problem 28.47E: A solenoid is designed to produce a magnetic field of 0.0270 T at its center. It has radius 1.40 cm... Problem 28.48E: A toroidal solenoid has an inner radius of 12.0 cm and an outer radius of 15.0 cm. It carries a... Problem 28.49E: A magnetic field of 37.2 T has been achieved at the MIT Francis Bitter National Magnetic Laboratory.... Problem 28.50E: An ideal toroidal solenoid (see Example 28.10) has inner radius r1 = 15.0 cm and outer radius r2 =... Problem 28.51E: A wooden ring whose mean diameter is 14.0 cm is wound with a closely spaced toroidal winding of 600... Problem 28.52E: A toroidal solenoid with 400 turns of wire and a mean radius of 6.0 cm carries a current of 0.25 A.... Problem 28.53E: A long solenoid with 60 turns of wire per centimeter carries a current of 0.15 A. The wire that... Problem 28.54E: The current in the windings of a toroidal solenoid is 2.400 A. There are 500 turns, and the mean... Problem 28.55P: A pair of point charges, q = +8.00 C and q' = 5.00 C, arc moving as shown in Fig. P28.55 with speeds... Problem 28.56P: At a particular instant, charge q1 = +4.80 106C is at the point (0, 0.250 m, 0) and has velocity 1... Problem 28.57P: Two long, parallel transmission lines, 40.0 cm apart, carry 25.0-A and 75.0-A currents. Find all... Problem 28.58P: A long, straight wire carries a current of 8.60 A. An electron is traveling in the vicinity of the... Problem 28.59P Problem 28.60P Problem 28.61P: An electric bus operates by drawing direct current from two parallel overhead cables, at a potential... Problem 28.62P: Figure P28.62 shows an end view of two long, parallel wires perpendicular to the xy-plane. each... Problem 28.63P Problem 28.64P: The long, straight wire AB shown in Fig. P28.64 carries a current of 14.0 A. The rectangular loop... Problem 28.65P: CP Two long, parallel wires hang by 4.00-cm-long cords from a common axis (Fig. P28.65). The wires... Problem 28.66P: The wire semicircles shown in Fig. P28.66 have radii a and b. Calculate the net magnetic field... Problem 28.67P: CALC Helmholtz Coils. Figure P28.67 is a sectional view of two circular coils with radius a. each... Problem 28.68P Problem 28.69P: CALC A long, straight wire with a circular cross section of radius R carries a current I. Assume... Problem 28.70P: CALC The wire shown in Fig. P28.70 is infinitely long and carries a current I. Calculate the... Problem 28.71P Problem 28.72P Problem 28.73P: An Infinite Current Sheet. Long, straight conductors with square cross sections and each carrying... Problem 28.74P: Long, straight conductors with square cross section, each carrying current I, are laid side by side... Problem 28.75P: A long, straight, solid cylinder, oriented with its axis in the z-direction, carries a current whose... Problem 28.76P Problem 28.77P: DATA You use a teslameter (a Hall-effect device) to measure the magnitude of the magnetic field at... Problem 28.78P: DATA A pair of long, rigid metal rods, each of length 0.50 m, lie parallel to each other on a... Problem 28.79CP: CP Two long, straight conducting wires with linear mass density are suspended from cords so that... Problem 28.80CP Problem 28.81PP: BIO STUDYING MAGNETIC BACTERIA. Some types of bacteria contain chains of ferromagnetic particles... Problem 28.82PP Problem 28.83PP: The solenoid is removed from the enclosure and then used in a location where the earths magnetic... format_list_bulleted