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Chapter 30: Q95P (page 902)
In Fig. 30-77,and the ideal battery has. (a) Just after switch S is closed, at what rate is the current in inductor 1 changing? (b) When the circuit is in the steady state, what is the current in inductor 1?
a) The rate of change of current in inductor 1 is,
b) The current in the inductor 1 is
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In Figure, a rectangular loop of wire with lengthis placed near an infinitely long wire carrying current i = 4.7 A. The loop is then moved away from the wire at constant speed v = 3.2 mm/s. When the center of the loop is at distance r = 1.5b, (a) what is the magnitude of the magnetic flux through the loop?(b) what is the current induced in the loop? 
A solenoid that is 85 cm long has a cross-sectional area of 17.0. There are 950of wire carrying a current of 6.60 A. (a) Calculate the energy density of the magnetic field inside the solenoid. (b) Find the total energy stored in the magnetic field there (neglect end effects).
The inductance of a closely packed coil of 400 turnsis 8.0 mH. Calculate the magnetic flux through the coil when the current is 5.0 mA.
In Figure (a), a circular loop of wire is concentric with a solenoid and lies in a plane perpendicular to the solenoid鈥檚 central axis. The loop has radius 6.00 cm.The solenoid has radius 2.00 cm, consists of , and has a current isol varying with time tas given in Figure (b), where the vertical axis scale is set by is and the horizontal axis scale is set by . Figure (c) shows, as a function of time, the energy Eth that is transferred to thermal energy of the loop; the vertical axis scale is set by . What is the loop鈥檚 resistance?
Figure (a) shows a circuit consisting of an ideal battery with emf , a resistance R, and a small wire loop of area . For the time interval t = 10 s to t = 20 s, an external magnetic field is set up throughout the loop. The field is uniform, its direction is into the page in Figure (a), and the field magnitude is given by B = at, where B is in Tesla, a is a constant, and t is in seconds. Figure (b) gives the current i in the circuit before, during, and after the external field is set up. The vertical axis scale is set by. Find the constant a in the equation for the field magnitude.
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