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Chapter 30: Q50P (page 899)
The current in an RL circuit builds up to one-third of its steady-state value in 5.00 s . Find the inductive time constant.
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Figure 30-30 gives the variation with time of the potential difference across a resistor in three circuits wired as shown in Fig. 30-16. The circuits contain the same resistance and emf but differ in the inductance L . Rank the circuits according to the value of L, greatest first.
In Figure, the magnetic flux through the loop increases according to the relation , whereis in milli-Weber and t is in seconds. (a) What is the magnitude of the emf induced in the loop when t = 2.0 s? (b) Is the direction of the current through R to the right or left?
In Figure, a circular loop of wire 10 cmin diameter (seen edge-on) is placed with its normal at an anglewith the direction of a uniform magnetic field of magnitude 0.50 T. The loop is then rotated such thatrotates in a cone about the field direction at the rate 100 rev/min; angleremains unchanged during the process. What is the emf induced in the loop?
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 shows a copper strip of width W = 16.0 cmthat has been bent to form a shape that consists of a tube of radius R = 1.8 cmplus two parallel flat extensions. Current i = 35 mAis distributed uniformly across the width so that the tube is effectively a one-turn solenoid. Assume that the magnetic field outside the tube is negligible and the field inside the tube is uniform. (a) What is the magnetic field magnitude inside the tube? (b) What is the inductance of the tube (excluding the flat extensions)?
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