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885_Physics ProblemsTechnical Physics

# 885_Physics ProblemsTechnical Physics - Chapter 31 Section...

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Chapter 31 225 Section 31.4 Induced emf and Electric Fields P31.32 (a) dB dt tt =− 600 800 2 .. ε = d dt B Φ At t = 200 . s , E Rd B d t r == π 2 2 2 2 800 00250 20 0 5 0 0 bg b g . Fq E × 800 10 21 N (b) When 600 0 2 −= , t = 133 s FIG. P31.32 P31.33 dB dt t = 00600 . εππ = d dt r dB dt rE B Φ 1 2 1 2 At t = 300 s , E r r dB dt = F H G I K J = ⋅⋅ F H G I K J 1 2 1 2 00200 1 . m 2 Ts s Ns 1 T C m 2 ej E 180 10 3 1 . N C perpendicular to and counterclockwise r FIG. P31.33 P31.34 (a) E ⋅= z d d dt B A Φ 2 2 ππ rE r dB dt = so Et = 987 100 .c o s mV m b g (b) The E field is always opposite to increasing B. clockwise . Section 31.5
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