Exploring Magnets

1.      A student brings one end of an unknown bar close to the north pole of a known magnet and observes attraction. What can be concluded about the bar?

• The bar is a magnet

• The bar may be magnetic substance, but not necessarily a magnet.
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• The bar is a magnetic substance.

• The bar is behaving both like a magnet and a magnetic substance

2     When a freely suspended bar magnet settles, it aligns in a particular direction. This is due to:

• Earth's gravitational field

• Air resistance

• Earth's magnetic field

• Friction with air molecules

3.    Which of the following correctly compares the magnetic strength at the poles and the center of a bar magnet?

• Strongest at the center, weakest at the poles

• Equal strength at both poles and center

• Strongest at the poles, weakest at the center

• Magnetic strength is uniform throughout

4.   A student is given three identical-looking metal rods: A, B, and C. They want to find out which one(s) are magnets. The student performed a test and observed the following:

Ø  Rod A is attracted to a known magnet but does not repel it from any side.

Ø  Rod B repels the south pole of a bar magnet.

Ø  Rod C neither attracts nor repels any pole of the magnet.

                 Which of the rod(s) is/are a magnet?

• Rod A

• Rod B

• Rod C

• All three

5.      A student is given three identical-looking metal rods: A, B, and C. They want to find out which one(s) are magnets. The student performed a test and observed the following:

Ø  Rod A is attracted to a known magnet but does not repel it from any side.

Ø  Rod B repels the south pole of a bar magnet.

Ø  Rod C neither attracts nor repels any pole of the magnet.

What can be concluded about Rod A?

• It is a magnet.

• It is a magnetic material but not a magnet.

• It is non-magnetic.

• None of the given

6. 6.You bring a magnet close to a magnetic compass, and the needle changes direction.

What does this observation suggest about how a magnetic compass works?

• The compass is broken and needs to be replaced

• The compass needle responds to nearby magnetic fields.

• The compass responds only to the earth’s magnetic field.

• The compass needle always points north, regardless of surroundings