NEET-XII-Physics
04: Moving Charges And Magnetism
- #8A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A, estimate the magnitude of B inside the solenoid near its centre.
Ans : Length of the solenoid, l = 80 cm = 0.8 m
There are five layers of windings of 400 turns each on the solenoid.
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Total number of turns on the solenoid, N = 5 × 400 = 2000
Diameter of the solenoid, D = 1.8 cm = 0.018 m
Current carried by the solenoid, I = 8.0 A
Magnitude of the magnetic field inside the solenoid near its centre is given by the relation,
Where,
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= Permeability of free space = 4``\pi`` × 10-7 T m A-1
Hence, the magnitude of the magnetic field inside the solenoid near its centre is 2.512 × 10-2 T.