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Chapter 30: Q51P (page 899)
The current in an RL circuit drops from1.0 A to 10 mA in the first second following removal of the battery from the circuit. If L is10 H, find the resistance R in the circuit.
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The wire loop in Fig. 30-22ais subjected, in turn, to six uniform magnetic fields, each directed parallel to the axis, which is directed out of the plane of the figure. Figure 30- 22bgives the z components Bz of the fields versus time . (Plots 1 and 3 are parallel; so are plots 4 and 6. Plots 2 and 5 are parallel to the time axis.) Rank the six plots according to the emf induced in the loop, greatest clockwise emf first, greatest counter-clockwise emf last.
A coil is connected in series with a resistor. An ideal 50.0 Vbattery is applied across the two devices, and the current reaches a value of 2.00 mAafter 5.00 ms.(a) Find the inductance of the coil. (b) How much energy is stored in the coil at this same moment?
A rectangular coil of N turns and of length a and width b is rotated at frequency f in a uniform magnetic field, as indicated in Figure. The coil is connected to co-rotating cylinders, against which metal brushes slide to make contact. (a) Show that the emf induced in the coil is given (as a function of time t) by. This is the principle of the commercial alternating-current generator. (b) What value of Nabgives an emf withwhen the loop is rotated at in a uniform magnetic field of 0.500 T?
Figure (a) shows, in cross section, two wires that are straight, parallel, and very long. The ratio of the current carried by wire 1 to that carried by wire 2 is. Wire 1 is fixed in place. Wire 2 can be moved along the positive side of the x-axis so as to change the magnetic energy density uB set up by the two currents at the origin. Figure (b) gives uB as a function of the position x of wire 2. The curve has an asymptote of, and the horizontal axis scale is set by. What is the value of (a) i1 and (b) i2?
A circular coil has a 10.0 cm radius and consists of 30.0closely wound turns of wire. An externally produced magnetic field of magnitude 2.60mTis perpendicular to the coil. (a) If no current is in the coil, what magnetic flux links its turns? (b) When the current in the coil is 3.80 Ain a certain direction, the net flux through the coil is found to vanish. What is the inductance of the coil?
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