# physics

how can i use a compass to determine whether a needle is magnetized?

put the needle in a cup of water very carefully. It will float. Now if the needle is magnetized it will point north/south no matter how you carefully rotate the cup. You can check the direction with a compass.

Point the end of the needle at one end of the compass needle. Depending upon which end you pick, the compass needle will move toward or away from the needle that you are holding, IF the needle is magnetized.

Iron filings are very handy to determine if anything is magnetized. You can make your own filings by filing on a piece of iron. THe filings will stick to magenetized things.

1. 👍
2. 👎
3. 👁

## Similar Questions

1. ### physics

A hypodermic syringe contains a medicine with the density of water (figure below). The barrel of the syringe has a cross-sectional area of 2.44 10-5 m2. In the absence of a force on the plunger, the pressure everywhere is 1.00

2. ### Physics

The pressure exerted by a phonograph needle on a record is surprisingly large. If the equivalent of 1.00 g is supported by a needle, the tip of which is a circle 0.200 mm in radius, what pressure is exerted on the record in N/m2?

3. ### physics

A hypodermic needle consists of a plunger of circular cross-section that slides inside a hollow cylindrical syringe. When the plunger is pushed, the contents of the syringe are forced through a hollow needle (also of circular

4. ### History

How did an astrolabe serve European explorers during the Age of Discovery? it was a navigation tool used to determine longitude an latitude by calculating the angle between the horizon and celestial body such as the moon, sun, or

1. ### Physics current directions

I need help In studying the cross section of a straight current carrying wire, you notice that the magnetic field lines run counter-clockwise. What is the direction of the current in the wire and how do you know? 2. You are

2. ### History

How did an astrolabe serve European explorers during the Age of Discovery? A) It was a navigational tool used to determine longitude and latitude by calculating the angle between the horizon and a celestial body such as the moon,

3. ### Physics

In Oersted's experiment, suppose that the compass was 0.30 m from the current-carrying wire. If a magnetic field of 1/3 the Earth's magnetic field of 5 10−5 T was required to give a noticeable deflection of the compass needle,

4. ### Geometry

1. The Seattle Space Needle is 604 feet tall. A model for the building is 48 inches tall. What is the ratio of the height of the model to the height of the actual Space Needle? A. 151:1 B. 151:12 C. 1:151 D. 12:151 If anyone knows

1. ### Physics

Blood from an animal is placed in a bottle 1.3 m above a 3.6 cm long needle, of inside diameter 0.35 mm , from which it flows at a rate of 2.1 cm3/min . What is the viscosity of this blood? Assume ρblood=1.05×103kg/m3.

2. ### english

CHEEVER: You see it, sir, it is a needle! HALE: Why? What meanin’ has it? CHEEVER (wide-eyed, trembling): The girl, the Williams girl, Abigail Williams, sir. She sat to dinner in Reverend Parris’s house tonight, and without

3. ### sew

6. You're repairing an armhole seam in a turtleneck used primarily for skiing. The stitching has come loose because of the extra arm movement. What type of hand stitch do you use? A. Backstitch B. Slipstitch C. Running stitch D.

4. ### AP Physics

The volume of liquid flowing per second is called the volume flow rate "Q" and has the dimensions of [L]^3/[T]. The flow rate of a liquid through a hypodermic needle during an injection can be estimated with the following