APFIVE Temperature Dependence of Paramagnetism
A solenoid with 500 turns per meter is filled with a paramagnetic material that has a relative permeability of μr = 1.02 at 300 K. The current in the solenoid is kept constant as the temperature of the core is reduced to 150 K. How does this temperature change affect the magnetic field inside the solenoid?
A
It becomes zero as the core becomes superconducting
B
It decreases because μr decreases at lower temperatures
C
It remains unchanged as μr is independent of temperature
D
It increases because μr increases at lower temperatures
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