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Chapter 30: Q74P (page 900)
Two solenoids are part of the spark coil of an automobile. When the current in one solenoid falls from to zero in 2.5ms, an emf of 30 kVis induced in the other solenoid. What is the mutual inductance M of the solenoids?
Short Answer is Missing in the Doucument
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Question: An electric generator contains a coil of 100 turnsof wire, each forming a rectangular loop 50.0cm to 30.0cm. The coil is placed entirely in a uniform magnetic field with magnitude B = 3.50 Tand withinitially perpendicular to the coil鈥檚 plane. What is the maximum value of the emf produced when the coil is spun at 1000 rev/min about an axis perpendicular to?
In Figure, a metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end. A magnetic field of magnitude B = 0.350 T points out of the page.(a) If the rails are separated by L=25.0 cmand the speed of the rod is 55.0 cm/s, what emf is generated? (b) If the rod has a resistance of 18.0and the rails and connector have negligible resistance, what is the current in the rod?
(c) At what rate is energy being transferred to thermal energy?
In Figure, a wire forms a closed circular loop, of radius R = 2.0mand resistance. The circle is centered on a long straight wire; at time t = 0, the current in the long straight wire is 5.0 Arightward. Thereafter, the current changes according to. (The straight wire is insulated; so there is no electrical contact between it and the wire of the loop.) What is the magnitude of the current induced in the loop at times t > 0?
Figure 30-27 shows a circuit with two identical resistors and an ideal inductor.
Is the current through the central resistor more than, less than, or the same as that through the other resistor (a) just after the closing of switch S, (b) a long time
after that, (c) just after S is reopened a long time later, and (d) a long time after that?
In Figure,the ideal battery has , and the fuse in the upper branch is an ideal3.0 A fuse. It has zero resistance as long as the current through it remains less than3.0 A . If the current reaches3.0 A , the fuse 鈥渂lows鈥� and thereafter has infinite resistance. Switch S is closed at timet = 0 . (a) When does the fuse blow? (Hint: Equation 30-41 does not apply. Rethink Eq. 30-39.) (b) Sketch a graph of the current i through the inductor as a function of time. Mark the time at which the fuse blows.
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