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A coil of wire of radius r has 600 turns and a self inductance of 108 mH. The self inductance of a coil with same radius and 500 turns is

Answer»

80mH
75mH
108mH
90mH

Solution :Self INDUCTANCE of the coil .
`L=(mu_(0)N^(2)pir)/2`
`LpropN^(2)r`
`L_(1)/L_(2)=(N_(1)/N_(2))^(2)(r_(1)/r_(2))`
`implies (108)/(L_(2))=((600)/(500))^2((r)/(r))`
`thereforeL_(2)=75mH.`


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