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AP Unit III D

This unit explores the forces exerted on current-carrying wires placed in magnetic fields. Topics include calculating the magnitude and direction of forces on straight wire segments and determining the implications for loops of wire. Students will learn to apply Fleming’s Left Hand Motor Rule to predict motion and the rotation of loops in magnetic fields. The unit covers key formulas for force and torque, including practical examples to illustrate how current interacts with magnetic fields and affects motion in various scenarios.

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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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