Isotropic Permeability in a Solenoid Core
A toroidal solenoid containing a nickel core carries a steady current. If the core is rotated 90° about its axis while the current is held constant, what is the effect on the magnetic field strength inside the solenoid?
A
It increases because the orientation enhances the field
B
It decreases substantially as the core is rotated
C
It becomes zero as core orientation cancels the field
D
The field remains unchanged because nickel’s permeability is isotropic in bulk form
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