APFIVE Isotropic Permeability in a Solenoid Core
A toroidal solenoid is wound with a nickel core and carries a steady current. If the nickel core is rotated 90° about its axis without changing the current, how does this affect the magnetic field strength inside the solenoid?
A
It increases because the orientation enhances the field
B
The field remains unchanged because nickel’s permeability is isotropic in bulk form
C
It decreases substantially as the core is rotated
D
It becomes zero as core orientation cancels the field
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