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[" 4.A coil is wound on a transformer of...

[" 4.A coil is wound on a transformer of rectangular cross- "],[" section.If all the linear dimensions of the former "],[" are increased by a factor of "2" and the number of "],[" turns per unit length of the coil remain unchanged,the "],[" self-inductance of the coil increases by a factor of - "],[[" a) "2," b) "4," c) "8," d) "16]]

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