An Unmagnetized Steel Bar Is Placed Inside a Solenoid

question 79

Multiple Choice

An unmagnetized steel bar is placed inside a solenoid.As the current in the solenoid is slowly increased from zero to some large value, the magnetization of the bar:

• A)increases proportionally with the current
• B)remains zero for a while and then increases linearly with any further increase in current
• C)increases with increasing current at first but later is much less affected by it
• D)is unaffected by the current
• E)increases quadratically with the current

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