A long solenoid of diameter 0.1 m has 2 × 10^4 turn per meter. At the center of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The curr…

Question

A long solenoid of diameter 0.1 m has 2 × 10^4 turn per meter. At the center of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to 0A from 4 A in 0.05 s. If the resistance of the coil is 10π^2Ω, the total charge flowing through the coil during this time is

Accepted Answer

Correct answer: C. (c) q = R= _0n (i-0 ) NAR N = Number of loops in coil A = Area of coil N = Number of turns per unit length of solenoid Q = 4 10^-7 2 10^4 4 100 10^-410 ^2 = 32µC

Solution

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