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**Magnetic Force on a Current Carrying Wire**

Physics Mrs. Coyle

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**Magnetic Force on a Current Carrying Wire**

Lorentz Force- Magnetic Force on a Current Carrying Wire (Fendt Applet)

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**Magnetic Force on a Current Carrying Wire**

F=BILsinq I: current (conventional) q: angle between I and B When q=90o, then F=BIL F

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Problem A wire 86cm long is carrying a current of 0.25A at right angles to a uniform magnetic field of 15T. Find the magnitude of the magnetic force. Answer: 3.3N

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Example What is the direction of the magnetic force acting on this wire? I Answer: Upwards

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DC Motor

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**Which way will the loop turn?**

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**Torque on a Current Carrying Loop**

Electric DC Motor (Fendt Applet)

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Basic DC Motor

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B = BA Cos Example 1.1 A coil consists of 200 turns of wire. Each turn is a square of side 18 cm, and a uniform magnetic field directed.

B = BA Cos Example 1.1 A coil consists of 200 turns of wire. Each turn is a square of side 18 cm, and a uniform magnetic field directed.

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