Chapter 30: Q. 13 (page 869)
13. Rank in order, from largest to smallest, the three time constants to for the three circuits in FIGURE Q30.13. Explain.
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The current in the solenoid of FIGURE EX30.12 is increasing. The solenoid is surrounded by a conducting loop. Is there a current in the loop? If so, is the loop current cw or ccw?
The L-shaped conductor in moves at across and touches a stationary -shaped conductor in a magnetic field. The two vertices overlap, so that the enclosed area is zero, at . The conductor has a resistance of ohms per meter.
a. What is the direction of the induced current?
b. Find expressions for the induced emf and the induced current as functions of time.
c. Evaluateandat.
A-cm-diameter coil has 20 turns and a resistance of CALC. A magnetic field perpendicular to the coil is where B is in tesla and t is in seconds.
a. Find an expression for the induced current I t as a function of time.
b. Evaluate I at and .
What is the magnetic flux through the loop shown in FIGURE EX30.4?
12. An LC circuit oscillates at a frequency of . What will the frequency be if the inductance is quadrupled?
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