39. The magnetic field Bcan be expressed as BtBBtbgbg=++010sin,ωφwhere B0= (30.0 T + 29.6 T)/2 = 29.8 T and B1= (30.0 T – 29.6 T)/2 = 0.200 T. Then from Eq. 30-25 EdBdtrrddtBBtBrt=FHGIKJ+=+12212010cos.ωWe note that = 2πfand that the factor in front of the cosine is the maximum value of
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