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An air-cored solenoid has 100 turns and is 1 m long. If the area of the cross section is 100 cm2, what will be its self-inductance (in μH)?
  • a)
    400 π
  • b)
    4 π
  • c)
    40 π
  • d)
    0.4 π
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
An air-cored solenoid has 100 turns and is 1 m long. If the area of th...
Concept:
Self-inductance 
Here, A = Area
N = Number of turns
l = Length of coil
μ0 = absolute permeability of material 
μr = relative permeability of material 
Calculation:
N = 100, l = 1 m,
A = 100 cm2 = 100 cm × cm = 100 × 10-2 m × 10-2 m = 100 × 10-4 m2
μ∘ = 4 π × 10-7, μr = 1 (Air)
40 π μH 
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Community Answer
An air-cored solenoid has 100 turns and is 1 m long. If the area of th...
Concept:
Self-inductance 
Here, A = Area
N = Number of turns
l = Length of coil
μ0 = absolute permeability of material 
μr = relative permeability of material 
Calculation:
N = 100, l = 1 m,
A = 100 cm2 = 100 cm × cm = 100 × 10-2 m × 10-2 m = 100 × 10-4 m2
μ∘ = 4 π × 10-7, μr = 1 (Air)
40 π μH 
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An air-cored solenoid has 100 turns and is 1 m long. If the area of the cross section is 100 cm2, what will be its self-inductance (in μH)?a)400 πb)4 πc)40 πd)0.4 πCorrect answer is option 'C'. Can you explain this answer?
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