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Understanding Battery Terminals and Measuring Magnetic Fields in Coils

Learn to identify positive and negative battery terminals, and explore the magnetic field inside coils. This guide presents an experiment using Logger Pro software to measure the magnetic field (B) in coils with N turns and a current (I). The formula B = (μ₀ * I * N) / L is detailed, where μ₀ is the permeability of free space. The experiment includes determining Earth's magnetic field, its inclination, and how the field of a bar magnet varies with distance. Discover practical applications and connections to everyday life.

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Understanding Battery Terminals and Measuring Magnetic Fields in Coils

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  1. Starter Which battery terminal is positive, and which is negative?

  2. Magnetic Field of a Coil The magnetic field inside a coil that has N turns, is L long, and has a current of I, is given by: B = moiN/L i = current in amps N = # of turns L = length in meters mo = 1.25 x 10-6

  3. Experiment Part 1 Logger-pro Using the Vernier magnetic field detector, a coil, the power supply on the circuit board, and a current sensor, determine the magnetic field inside two different coils for a given current. Use this value to determine the number of turns in each coil. N = (BL/moi)

  4. Part 1 Coil Current Setup

  5. Experiment Part 2 Vernier – Loggerpro Using the Vernier magnetic field detector: 1. Determine the magnetic field of the Earth. 2. Determine the Inclination of the field in degrees. 3. Check your data with NOAA website. 4. Determine how the magnetic field of a bar magnet depends on the distance form the magnet. Plot B vs. x.

  6. Connection Where do you encounter magnetic coils every day?

  7. Exit Write down the formula for the B-field in a coil and describe each term.

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