Question

lisa made the electromagnet shown. what can lisa do to increase the strength of the electromagnet? she can use a nail with weaker magnetic properties. she can change the direction of the nail. she can increase the number of wire loops. she can reduce the current in the wire.

Explanation:

To determine how to increase the electromagnet's strength, recall factors affecting electromagnetism: number of wire loops, current, and core material.

• Using a nail with weaker magnetic properties would decrease strength (core should be ferromagnetic/strong magnetic).
• Changing the nail's direction affects polarity, not strength.
• Increasing wire loops increases the magnetic field (more loops → stronger magnetism).
• Reducing current decreases strength (current is proportional to magnetic field for a solenoid).

So the correct option is the one about increasing wire loops.

Answer:

She can increase the number of wire loops.