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Chapter 30: Q. 34 (page 871)
What value of resistorgives the circuit in FIGURE a time constant of
Value of resistor with time constant is.
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A cmcm square loop of wire lies in the -plane with its bottom edge on the -axis. The resistance of the loop is. A magnetic field parallel to the -axis is given by, where is in tesla, in meters, and in seconds. What is the size of the induced current in the loop at ?
67. II FIGURE P30.67 shows the potential difference across a potential difference across a inductor. The current through the inductor at is . Draw a graph showing the current through the inductor from to
FIGURE shows a U-shaped conducting rail that is oriented vertically in a horizontal magnetic field. The rail has no electric resistance and does not move. A slide wire with mass and resistance can slide up and down without friction while maintaining electrical contact with the rail. The slide wire is released from rest.
a. Show that the slide wire reaches a terminal speed , and find an expression for .
b. Determine the value of if and
What is the magnetic flux through the loop shown in FIGURE EX30.4?
74. II The inductor in FIGURE P30.74 is a -long, diameter solenoid wrapped with 300 turns. What is the current in the circuit after the switch is moved from a to b ?
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