Self-induction and inductance
Answers are for parents and teachers.
1
L = 0.4 H, ΔI = 3 A, Δt = 0.06 s. What is |Eₛ| in V?
20
2
|Eₛ| = 30 V and ΔI/Δt = 150 A/s. What is the inductance in mH?
200
3
At a current of 4 A the flux in a coil is 80 mWb. What is the inductance in mH?
20
4
Why may a spark appear at the switch contacts when a circuit with a large coil is opened?
The current falls quickly, ΔI/Δt is large, and the self-induced EMF produces a very high voltage.
5
On which quantities does inductance depend and on which not: current, number of turns, core material?
It depends on the number of turns and the core material (geometry), not on the current (as long as μ stays constant).