With permanent magnets opposite poles attract and like poles repel. As we have seen magnetic fields surround any current carrying wire. Therefore it stands.

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Presentation transcript:

With permanent magnets opposite poles attract and like poles repel. As we have seen magnetic fields surround any current carrying wire. Therefore it stands to reason that magnetic forces will act on wires carrying electric current and charged particles moving in a magnetic field.

X X S N

Note that above the wire both the permanent magnetic field and the field generated by the wire (the red lines) point in the same direction These two fields will repel. Also, below the wire the permanent magnetic field and the field generated by the wire (the green lines) point in opposite directions. These two fields will attract.

F = BIlsin Ɵ

Note that if the conductor is perpendicular to the magnetic field this formula becomes: F = B I l Because sin(90 o ) = 1 If the conductor is parallel to the magnetic field then there is no magnetic force acting on it.

Moving Charges in Magnetic Fields In the same way that charged particles moving through a wire will experience a force in a magnetic field, so will free charged particles. To determine the direction of the force on such a particle we simply use the RHR. Moving Charges in Magnetic Fields In the same way that charged particles moving through a wire will experience a force in a magnetic field, so will free charged particles. To determine the direction of the force on such a particle we simply use the RHR.

Moving Charges in Magnetic Fields NOTE: We use the right hand rules for wires when talking about conventional current And the left hand rules for wires when talking about electron flow. Moving Charges in Magnetic Fields NOTE: We use the right hand rules for wires when talking about conventional current And the left hand rules for wires when talking about electron flow.

Moving Charges in Magnetic Fields We follow the same logic when dealing with charged particles: For positive particles use RHR For negative particles use LHR Moving Charges in Magnetic Fields We follow the same logic when dealing with charged particles: For positive particles use RHR For negative particles use LHR

To calculate the magnetic force on the particle we use: Where:q = v = B = θ = F = qvBsin Ɵ F = qvB

X X X X X X X X X X X X X X X X X X X X X X XX

Now consider a proton moving through the same magnetic field X X X X X X X X X X X X X X X X X X X X X X XX