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The self-inductance of two solenoids A and B having equal length are same. If the number of turns in two solenoids A and B are 100 and 200 respectively,the ratio of the radii of their cross-section will be ........,choose the correct option from the given options. (A) 2:1 (B) 1:2 (C) 1:4 (D) 4:1

Answer»

udent,◆ Answer - (A)R1 : R2 = 2 : 1◆ Explanation -Given that self inductance of both solenoids is same.L1 = L2μₒ.N1².A1/l = μₒ.N2².A1/lN1².πr1² = N2².πr2²r1²/r2² = N2²/N1²r1/r2 = N2/N1r1/r2 = 200/100r1/r2 = 2Therefore, ratio of radii of cross-section of solenoids is 2:1.Thanks buddy...



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