Physics > Lab Report > The City College of New York, CUNYPHYSICS 204Physics_Lab_4-_Induction (All)

The City College of New York, CUNYPHYSICS 204Physics_Lab_4-_Induction

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Introduction Generators and electromagnets are able to produce electricity due to the electromotive force. The electromotive force is the measure of energy as a current flows through a circuit. Thi... s is all related to Faraday’s Law which states that the change in the magnetic field of a coil causes a voltage to be induced. 1. Bar Magnet Click on the bar magnet tab, a bar magnet and compass should show up on the simulation. Explore this combination by moving the bar magnet and then by moving the compass. The red color refers to North and the white color refers to South. Why does the compass north always point to the bar magnet south? The compass north always points north to the bar magnet south because in magnets opposite poles attract and like poles repel, and since a compass is a magnet the compass north points to the bar magnet south. Since a compass needle is said to always point to the geographic North Pole on Earth, could the geographic North Pole be actually a magnetic south pole? Yes, a compass needle can point to the geographic North Pole on Earth which could be a magnetic south pole because there is an electric current in earth’s core that rotates, thus when the rotation is reversed the north and south poles may reverse. Also, since the magnetic south is attracted towards the north pole and vice versa, the geographic north pole is the magnetic south pole. What about if you were to cut the bar magnet in half, would the north pole be now separated from the south pole so the resulting two halves of the original bar magnet will now be a south pole half and a north pole half? If a bar magnet were cut in half it would have its own north and south pole because all magnets have two poles, and north and south poles cannot be separated. Explore the B field by clicking “Show Field Meter”. Determine where the B field is the strongest and areas where it is weakest. The B field is strongest when the compass is in between the poles, not when it is closest to either the north or south pole [Show More]

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