Lab9_Magnetism

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101

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Physics

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Dec 6, 2023

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PHY 101 Lab 9: Magnetism Activity 1 Properties of Electric Circuits 1. What happens to the compass needle when the circuit is completed? When the circuit is completed, and an electric current flow through it, the compass needle is affected. It tends to align itself with the magnetic field produced by the current, resulting in a change in its orientation. 2. Describe the direction and movement of the compass needle when the circuit is completed. The compass needle will move, aligning itself with the magnetic field produced by the current. The direction of the movement will depend on the direction of the electric current in the circuit. If the current flows from the north pole of the battery to the south pole, the compass needle's north end will point in the direction of the magnetic field produced. Activity 2 Solenoid 3. Explain how the solenoid could be modified to pull the iron core down the cylinder more quickly. To make the solenoid pull the iron core down the cylinder more quickly, you can:  Increase the number of wire coils in the solenoid.  Increase the current passing through the wire.  Use a thinner and lighter iron core.  Reduce any friction or resistance in the cylinder. 4. If the metal rod was replaced with a cylindrical permanent magnet, as in some power locks, how could you make the rod move in and then move out, to lock and unlock ?

To make the rod move in and out for locking and unlocking using a cylindrical permanent magnet, you can:  Reverse the direction of the electric current flowing through the solenoid when you want to change the position of the rod. This can be achieved by using a switch or a control system.  Implement a system that controls the polarity of the permanent magnet. When the magnet's polarity is in one direction, it pulls the rod in; when reversed, it pushes the rod out. Activity 3 Coiled Wire Electromagnet 5. Describe how to determine which end of the nail is north using the right-hand rule. To determine which end of the nail is north using the right-hand rule, follow these steps:  Hold the nail in your right hand, with your fingers wrapped around it as if you were gripping it.  The direction your thumb points when you wrap your fingers around the nail represents the direction of the magnetic field. The end of the nail your thumb points to is the north end. 6. Describe how to determine which end of the nail is north by using the magnetic compass. To determine which end of the nail is north by using the magnetic compass:  Bring a magnetic compass close to the nail.  The end of the nail that attracts the north-seeking pole (usually the red end of the compass needle) of the compass is the nail's north end. 7. Describe how the electromagnet's strength was affected by removing the iron core and by removing half of the coils. The electromagnet's strength is affected as follows: o Removing the iron core: The magnetic field generated by the electromagnet significantly weakens because the iron core enhances its magnetic properties. 1 © 2016 Carolina Biological Supply Company

o Removing half of the coils: The strength of the electromagnet is reduced because fewer coils result in a weaker magnetic field. The number of coils directly affects the magnetic strength of the electromagnet. 2 © 2016 Carolina Biological Supply Company

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