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Physics, 22.06.2019 07:10
Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ât. the resistance of the coil is r, and the total charge is q = iât, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly âswipedâ past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be âswipedâ through the reader at exactly the right speed? why or why not?
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Physics, 22.06.2019 09:00
Sobre transformaçÔes cĂclicas, sĂŁo feitas algumas afirmaçÔes, determine quais estĂŁo corretas. i â a variação de energia interna em uma transformação cĂclica Ă© nula; ii â o trabalho, em uma transformação cĂclica, Ă© sempre positivo; iii â ao completar um ciclo, o gĂĄs tem a mesma temperatura com a qual começou a transformação; iv â uma transformação cĂclica Ă©, obrigatoriamente, composta de transformaçÔes conhecidas, como adiabĂĄtica, isocĂłrica, etc: a) i e iii b) i e ii c) ii e iii d) i e iv e) iii e iv
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Physics, 22.06.2019 17:00
Amajor difference radio waves, visible light, and gamma rays is the of the photons, which results in different photon frequencies and wavelengths
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