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Understanding Magnetic Fields in Current-Carrying Wires

Explore how a current-carrying wire generates a magnetic field using the Right Hand Curl Rule. Learn to calculate magnetic field strength and force of attraction between wires. Discover practical examples and interactive simulations. Increase your knowledge of physics today!

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Understanding Magnetic Fields in Current-Carrying Wires

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  1. Magnetic Field due to a Current-Carrying Wire Physics Mrs. Coyle

  2. A Current-Carrying Wire Causes a Magnetic Field Around it.

  3. Hans Christian Oersted, 1820

  4. Right Hand Curl Rule

  5. Magnetic Fields of Long Current-Carrying Wires B = mo I 2p r I = current through the wire (Amps) r = distance from the wire (m) mo = permeability of free space = 4p x 10-7 T m / A B = magnetic field strength (Tesla) I

  6. Example 1 • What is the magnitude of the magnetic field created by a 0.25A current at a distance of 50cm from the wire? • Answer: 1x10-7 Tesla

  7. Magnetic Field of a Current Carrying Wire • http://www.walter-fendt.de/ph14e/mfwire.htm

  8. Magnetic Field in the Center of a Current-Carrying Loop (Ring) B = mo I 2r

  9. Note • The overall shape of the magnetic field of the circular loop is similar to the magnetic field of a bar magnet.

  10. Magnetic Field at Center of a SolenoidB = mo NIL N: Number of turns L: Length n=N/L ------------------------L----------------

  11. Force of Attraction Between Two Long Current-Carrying Wires F= mo I1 I2 L 2p d d : distance between wires I : current L: length of wire

  12. Note • If the wires have currents in opposite directions, the wires repel each other.

  13. Example 2 • What is the force of attraction felt by two 4m long current-carrying wires carrying currents of 2A and 3A, that are 60cm from each other? • Answer: 8x10-6 N

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