A solenoid of 1.5 m long with inner diameter of 4 cm has three layers of windings of 1000 turns each & carries a … 2.1 …
Answers:
The correct option (b) 6.31 × 10–6 wb
Explanation:
L = 1.5 m
I = 2A
Total number of turns = 3 × 1000 = 3000
∴ Turns per unit meter = n = [(3000) / (1.5)] = 2000
r = [(4 cm)/2] = 2 × 10–2 m
As ɸ = AB cos θ = AB cos 0
ɸ = AB
put B = μonI & A = πr2 we get
ɸ = π r2 × μonI = π × (2 × 10–2)2 × 4π × 10–7 × 2000 × 2
∴ θ = 6.31 × 10–6wb