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Asked by Munawar Last Modified
Answer Length of the solenoid, L = 60 cm = 0.6 m
Radius of the solenoid, r = 4.0 cm = 0.04 m
It is given that there are 3 layers of windings of 300 turns each.
Total number of turns, n = 3 × 300 = 900
Length of the wire, l = 2 cm = 0.02 m
Mass of the wire, m = 2.5 g = 2.5 × 10−3 kg
Current flowing through the wire, i = 6 A
Acceleration due to gravity, g = 9.8 m/s2
Magnetic field produced inside the solenoid,
Where,
= Permeability of free space = 
I = Current flowing through the windings of the solenoid
Magnetic force is given by the relation,
Also, the force on the wire is equal to the weight of the wire.
Hence, the current flowing through the solenoid is 108 A.
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