How can a magnetic field product a current? Previously, you have used the built

Question

How can a magnetic field product a current? Previously, you have used the built in functions of digital multimeters to serve as a voltmeter or ammeter. In those cases you learned how to avoid damaging the equipment before you started the lab. Therefore, before starting this lab let's investigate how a galvanometer works. A galvanometer is shown in the picture to the right. The galvanometer is designed to measure miniscule values of current and because of that many galvanometers do not have units on their face. 1. Why would it be advantageous, to measure miniscule measure levels of current m this lab. Explain your answer with your knowledge of physics and justify your answer based on what you will be asked do in this lab. 2. What kind of measurement issues could you have when using a galvanometer? Consider how fast small levels of current might change. Make sure you explain your answer. 3. How could you damage your galvanometer and how could avoid this? Explain your answer.

Explanation / Answer

1. It is advantageous to use miniscule values of current because galvanometer is designed to detect even smallest amount of current hence its resistance is low. If higher amount of current will flow , it will damage or burn the coil of galvanometer.

2.At times due to bit high flow of current, galvanometer pointer starts shaking or permanent reading is created in it . As galvanometer detects even small changes in current hence its pointer moves widely with small changes in current .

3. With strong values of current galvanometer coil can be burnt and can be damaged. To avoid this a suitable amount of low resistance wire can be connected in parallel to the galvanometer , which is called shunt.

This qill bypass higher amount of current and allow the current required for full scale deflection of the galvanometer to pass through it.

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