Questions
How much length of a very thin wire is required to obtain a solenoid of length and inductance L?
detailed solution
Correct option is C
Suppose solenoid has N turns, each of radius r and length of wire is l.Its self-inductance, L=μ0N2Al0=μ0N2πr2l0 ….(i)Also, length of the wire, l=N×2 πr ⇒N2r2=l24π2 … (ii)From equations (i) and (ii), l=4πLl0μ0Talk to our academic expert!
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A coil is wound as a transformer of rectangular cross-section. If all the linear dimensions of the transformer are increased by a factor 2 and the number of turns per unit length of the coil remain the same, the self inductance increased by a factor of
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