- #1
fishingspree2
- 139
- 0
Homework Statement
A circular coil has a radius 0.10 m and 30 turns. An external magnetic field 2.60 mT is perpendicular to the coil. a) If there is no current, find the magnetic flux in the coil.
b) When current = 3.8 A in some direction, there is no more net flux in the coil. Find the inductance.
The Attempt at a Solution
I can do a) but I don't understand b. the correct answer of b) is 0.645 mH
a) flux = NB*PI*r^2 = 2.45 miliweber, this is the correct answer
b) L = N*flux / current. If I set flux=0 then I get inductance = 0, which makes no sense because inductance only depends of the geometry.
Please help =(
Last edited: