APFIVE Magnetic Permeability in a Solenoid
A material has a magnetic permeability of μ = 5μ₀, where μ₀ is the permeability of free space. When this material is inserted into a long solenoid carrying a current, by what factor does the magnetic field inside the solenoid change relative to its value with an air core?
A
1/5
B
25
C
5
D
√5
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