Why can a solenoid be used to magnetise a piece of soft iron placed inside it?

Question

Why can a solenoid be used to magnetise a piece of soft iron placed inside it? — Exam MCQ

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B. Because the solenoid produces a strong and uniform magnetic field inside it — The correct choice is Because the solenoid produces a strong and uniform magnetic field inside it. The result follows from the relevant magnetic-field, electromagnetic-induction or Fleming/right-hand-rule principle.

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A. Because the solenoid creates a weak and scattered magnetic field inside it

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C. Because the solenoid blocks magnetic fields from entering soft iron

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D. Because the solenoid produces a non-uniform field only outside it

Why can a solenoid be used to magnetise a piece of soft iron placed inside it?

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