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Chapter 30: Q49P (page 899)
The inductor arrangement of Figure, with
is to be connected to a varying current source. What is the equivalent inductance of the arrangement?
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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 “blows” 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.
One hundred turns of (insulated) copper wire are wrapped around a wooden cylindrical core of cross-sectional area . The two ends of the wire are connected to a resistor. The total resistance in the circuit is. If an externally applied uniform longitudinal magnetic field in the core changes from 1.60 Tin one direction to1.60 T in the opposite direction, how much charge flows through a point in the circuit during the change?
Figure 30-29 shows three circuits with identical batteries, inductors, and resistors. Rank the circuits, greatest first, according to the current through the resistor labeled R (a) long after the switch is closed, (b) just after the switch is reopened a long time later, and (c) long after it is reopened
In Figure, a long rectangular conducting loop, of width L, resistance R, and mass m, is hung in a horizontal, uniform magnetic fieldthat is directed into the page and that exists only above line a. The loop is then dropped; during its fall, it accelerates until it reaches a certain terminal speed. Ignoring air drag, find an expression for.
A wire loop of radius 12 cmand resistanceis located in a uniform magnetic field that changes in magnitude as given in Figure. The vertical axis scale is set by, and the horizontal axis scale is set by. The loop’s plane is perpendicular to. What emf is induced in the loop during time intervals (a) 0 to 2.0 s,(b) 2.0 s to 4.0 s, and (c) 4.0 s to 6.0 s?
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