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A current carrying wire in a magnetic field

A current carrying wire in a magnetic field. We know that a wire carrying a current can be made into an electromagnet. Consequently, such a wire will behave like a magnet. If this wire is placed near a permanent magnet, it will experience a force.

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A current carrying wire in a magnetic field

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  1. A current carrying wire in a magnetic field • We know that a wire carrying a current can be made into an electromagnet. Consequently, such a wire will behave like a magnet. If this wire is placed near a permanent magnet, it will experience a force. • We can use Flemings left hand rule to predict the direction of this force. In fact, we can also use it to predict the direction of any one of the following (if the the direction of the other two is known). • the direction of flow of conventional current. • the direction of the magnetic field (from north to south). • the direction of the force exerted on the wire.

  2. Flemings Left Hand Rule Force (thumb) Field (first finger) Current (second finger)

  3. Animation of a current carrying wire in a magnetic field

  4. How could you increase the strength of the force? More current More resistance Stronger magnetic field TRUE/FALSE TRUE/FALSE TRUE/FALSE

  5. The DC Motor Uses Motor effect principle. How does it work? Each side of coil pushed in opposite direction due to motor effect. This results in the coil rotating. N S What happens if you reverse the direction of current or magnetic field? The coil will spin in opposite direction.

  6. Electromagnetic induction What will happen if you move a magnet into a coil of wire? A current is induced in the coil. Only when the magnet is moving.

  7. Stationery magnet What happens when the magnet is in the coil? Nothing!! A current is only induced when the magnet is moving.

  8. Electromagnetic induction What will happen if you move the magnet out of the coil of wire? A current is induced in the coil. This time in the opposite direction. If you reverse the direction of the movement, then you reverse the direction of the current.

  9. AC or DC? What will happen if you move a magnet in and out of the coil repeatedly? A current will be induced in the coil, the current will flow in one direction and then reverse and flow in the opposite direction. What type of current is this? Alternating current

  10. Increasing the size of the current How can you increase the size of the current? more coils stronger magnetic field faster movement

  11. AC generator What are the four ways you can increase the current from an AC generator? 1. _____________________ 2. _____________________ 3. _____________________ 4. _____________________ ? Faster movement Stronger magnetic field More coils Larger area of coils

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