4B_SP10_HW11 - Print Assignment: 4B Homework 11 :

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*Question 1 A rectangular loop of N closely packed turns is positioned near a long straight wire as shown in Fig. below. What is the mutual inductance M for the loop–wire combination if N = 132, a = 1.1 cm, b = 11 cm, and l = 55.0 cm? Number 34.8 Units μH The number of significant digits is set to 3; the tolerance is +/-2% *Question 2 A solenoid that is 98.3 cm long has a cross-sectional area of 17.8 cm 2 . There are 1390 turns of wire carrying a current of 6.10 A. (a) Calculate the energy density of the magnetic field inside the solenoid. (b) Find the total energy in joules stored in the magnetic field there (neglect end effects). (a) Number 46.7 Units J/m^3 (b) Number 0.0818 Units J Answer a1: the number of significant digits is set to 3; the tolerance is +/-2% Answer b1: the number of significant digits is set to 3; the tolerance is +/-2% *Question 3 The switch in the figure 30-20 is closed on a at time t = 0. What is the ratio ε L (a) just after t = 0 and (b) at t = 3.98τ L ? (c) At what multiple of τ L will ε L /ε = 0.500? Figure 30-20 (a) 1.00 (b) 0.0187 (c) 0.693 Print Assignment: 4B Homework 11 :: http://edugen.wiley.com/edugen/shared/assignment/test/agprint.uni?numb. .. 1 of 4
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This note was uploaded on 11/17/2010 for the course PHYC 4B taught by Professor Afdsadsf during the Spring '09 term at City College of San Francisco.

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4B_SP10_HW11 - Print Assignment: 4B Homework 11 :

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