Multiple choice

When a piece of soft iron is placed inside a current carrying solenoid, the magnetic field of the electromagnet produced

  1. disappears in a few seconds

  2. disappears when the current is turned off

  3. never disappears

  4. disappears when the current is increased

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, it is correct. The magnet formed by producing a magnetic field inside a solenoid is called an electromagnet, but when the current is turned off, the magnetic field disappears.

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