Lab 2 The Current Balance

Measure the mass and calculate the density of the magnet using the correct significant figures and units. Show work for full credit. (2 points)

The magnetic field rotates 180 degrees when the battery slider moves from one side of the battery to the other.

Observation 2-1: The direction (push/pull) of the force exerted on the Force Probe hook determines whether the force is positive or negative. Complete the table below.

5. At a coil current of 3 A, what is the magnetic field produced at the center of the Helmoltz coils in gauss? About what is the magnitude of the Earth’s field in gauss?

Lenz’s Law: “An induced EMF always gives rise to a current that creates a magnetic field that opposes the original change in flux ”1

Lab Activity: Log on and go to the PhET website (PhET.colorado.edu) Go to simulations, then “electricity” then to the following:

The Railroad and the Pony Express has been the only way to communicate remotely and send correspondence. Joseph Henry and Samuel F.B. Morse would sculpture the future of communication with the invention of the electromagnet and telegraph. Joseph was a graduate of Princeton (Then called the College of New Jersey) as a physicist. The fascination with electricity and magnetism in which he had read reports on from Europe fascinated his desire to research and develop an electromagnet. This shaped our future of electricity as we see it today. With the ability to distinguish between high amperage circuits and high voltage circuits, this laid the baseline for what we know today as “Inductance”. Electrical conductor produces energy by the changing of current or the changing of voltage to produce a strong magnetic force while only using a small battery. By Joseph Henry’s introduction to inductance also paved a path for the invention of electric motors. These advances in technology developed a method for illuminating homes and streets. The use of electricity was spreading almost as fast as the railroad. This improved the lifestyle and functionality of America. (Tindall, Shi

How did the wood desktop effect the motion of the circle magnet? Do then magnet force line travel in the earth as well in the atmosphere? What do

of the meter resulted to 11.98 rev. of the standard. g). Indicate the percent error of the above test. h).

A train is travelling with a constant velocity of 80 kmh-1 in a area where the vertical component of the Earth’s magnetic field is 3.6 × 10-5 T. a. b. What is the size of the EMF induced across each 1.0 m long axle? [ 8.0 × 10-4 V] If the train is travelling in a south westerly direction, describe the force acting on the electrons on each axle.

Also, we need to understand words like meniscus, parallax, the difference between accuracy and precision, the use of a metric system, the use of scientific notation, and etc. Furthermore, the purpose for doing this experiment is to understand why measurements is not precise and how to describe uncertainty and error. This is important because we’re going to face the same problem every time we do the same type of lab, and when the

According to our percent error computations, the graphical method is more accurate than the experimental method. For instead, the percent difference between experimental to

Weigh a dry 25 mL graduated cylinder on the digital scale. Record the mass in Data Table 5.

Examine the apparatus. The top measurement device is the force sensor and will be connected into A analog input of the Science Workshop interface.

As in the case of electric charges, it is convenient to introduce the concept of a magnetic field in describing the action of magnetic forces. Magnetic field lines for a bar magnet are pictured below.