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JEE Main20249 Apr 2024Morning ShiftPhysicsElectromagnetic InductionActual

When a coil is connected across a 20 ~V dc supply, it draws a current of 5 ~A . When it is connected across 20 ~V , 50 ~Hz ac supply, it draws a current of 4 ~A . The self inductance of the coil is ______ mH . ( Take =3 )

Correct answer

0

Step-by-step solution

Case-I: i= 20 R R=4 Case-II: aligned & i = 20 Z & 4= 20 R ^2+ X _ L ^2 R ^2+ X _ L ^2 =5 & R ^2+ X _ L ^2=25 X _ L =3 & L = 3 2 f = 1 2 50 = 1000 100 mH & L =10 mH aligned

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