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AP Unit III D

AP Unit III D. 2. Forces on current carrying wires in magnetic fields. Students should understand the force exerted on a current carrying wire in a magnetic field, so they can:

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AP Unit III D

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  1. AP Unit III D 2. Forces on current carrying wires in magnetic fields

  2. Students should understand the force exerted on a current carrying wire in a magnetic field, so they can: • a) Calculate the magnitude and direction of the force on a straight segment of current carrying wire in a uniform magnetic field. • b) Indicate the direction of the magnetic forces on a current carrying LOOP of wire in a magnetic field and determine how the loop will tend to rotate as a consequence of these forces. • c) Calculate the magnitude and direction of the torque experienced by a rectangular loop of wire carrying a current in a magnetic field

  3. x means magnetic field B going INTO paper . means field coming out of paper x x x e x x x - ve + ve Conventional Current Direction of force given by Fleming’s Left hand Motor Rule – thuMb – Motion, First finger – field (pointing towards south), seCond finger – current

  4. - ve + ve Current in Rectangular Loops - Which way will the loop turn? This is the motor effect. x x x x x x x x x Top view + Side view

  5. Motor

  6. The force (F) on the wire is equal to the magnetic field strength B x current I x length of wire L. (F= BIL) A charge moving in a magnetic field will also undergo a force. The force F is equal to the magnetic field strength B x charge Q x velocity of charge v (F= BQv) • What is the force on a wire of 10 meters long with a current of 2 amps in a field of 6 x 10-4 Teslas. • What is the force on an electron in a magnetic field of 4 T traveling at 3 x 103 m/s. • What direction will it move in.

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