Placing a soft-iron core inside a solenoid:

  1. has no effect
  2. greatly increases the magnetic field
  3. reverses the field
  4. reduces the field
Answer

B) greatly increases the magnetic field

Iron becomes magnetised and adds its own field. SLO P-09-E-36 · Knowledge

Physics MCQ · More Magnetism and Electromagnetic Induction MCQs · Practise