Question

Which of the following actions will decrease the strength of the magnetic field of an electromagnet?
1. Using fewer loops of wire per meter in the coil
2. Decreasing the current in the wire
3. Removing the iron core

• A. Only 2
• B. Only 1 and 3
• C. Only 2 and 3
• D. All 1, 2 and 3

Answer 1

The correct option is D All 1, 2 and 3

The strength of an electromagnet depends on:
1. Strength of the current passing through the coil- The greater the current, the greater the strength.
2. Number of turns in the coils- The greater the number of turns, the greater the strength.
3. Material used as core- Soft iron will magnetize more readily than steel. Therefore, using a soft iron core increases the strength of the electromagnet.
Thus, using fewer loops of wire per meter in the coil, decreasing the current in the wire and removing the iron core will decrease the strength of the magnetic field of an electromagnet.