Based on the trends you observed in the laboratory exercise, which objects would you expect to be attracted to a bar magnet? Check all that apply. a metal hammer
a wooden ruler
a plastic car
the metal frame of your chair
the paper in your notebook
the screws and nails that hold your desk together

The correct answer is - 1. a metal hammer

4. the metal frame of your chair

6. the screws and nails that hold your desk together.

Explanation:

Bar magnets are rectangular objects made up of ferromagnetic objects or substances and must carry the north and south pole ends. These objects show ferromagnetism and attract any ferromagnetic metal such as iron, steel  or ferromagnetic composite.

In the case of the same ends, for instance, the north-north pole of two magnets repulse and opposite attract to one another. From the given options the correct answer is a metal hammer, the metal frame of chair and screws and nails that hold the desk.

(B) 200 turns

Explanation:

Magnitude of the induced magnetic field is linearly proportional to the number of turns per unit length. Thus, a greater number of turns would mean a greater magnitude of Magnetic Field. Hence, the answer is (B) 200 turns.