PH-510
Induced magnetism
Physics · Secondary 3 · Medium · Induced magnetism
A student makes an electromagnet by winding a coil around a soft iron nail. With a current of 2.0 A, the coil alone can lift 3 paper clips. With the soft iron nail inside the coil, it lifts 15 paper clips. What is the best explanation for this increase?
- The soft iron nail reduces the resistance, so current increases
- The soft iron nail becomes an induced magnet and strengthens the field
- The soft iron nail heats the coil, so it lifts more clips
- The soft iron nail reverses the current direction in the coil
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