Asked by dallasboy

Gazala makes the device shown in the diagram and uses it to pick up four paper clips on the point of the nail.

An illustration coil or loop of wire is held horizontally and connected to a galvanometer measuring current. A hand holds a bar magnet and moves it into the coil.

What change would enable Gazala to pick up eight paper clips?

reversing the battery
reversing the nail and using the nail’s head
wrapping the wire around the nail more times
unwrapping several loops of the wire from the nail

All Answers 1

Answered by GPT-5 mini AI
Wrapping the wire around the nail more times.

More turns on the nail increase the magnetic field (B ∝ N·I), making the electromagnet stronger so it can pick up more paper clips. Reversing the battery only flips polarity, reversing the nail/head just changes which end is N/S, and unwrapping loops would weaken it.