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Class11HO

# Class11HO - Class 11 Faradays Law Physics 106 Fall 2011...

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Class 11 Faraday’s Law Physics 106 Fall 2011 Press CTRL-L to view as a slide show.

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Learning Outcomes Last time, we discussed: I Examples of the Lorentz force. I Magnetic forces on a wire. I Motion of a charge in a magnetic field. I Torques and forces on current loops. I Electric Motors
Learning Outcomes Today we will discuss: I Magnetic dipole in a nonuniform field I Induced electric fields and Faraday’s Law I Lenz’s Law

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Direction of the Field of a Long Straight Wire - Right Hand Rule #2 I Grasp the wire in your right hand I Point your thumb in the direction of the current I Your fingers will curl in the direction of the field
Direction of the Field inside a Wire Loop - Right Hand Rule #3 I Put your fingers in the direction of the current I The magnetic field is in the direction of your thumb

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Force between Parallel Wires I A wire has current coming out of the screen.
Force between Parallel Wires I Magnetic field lines circle around the wire.

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Force between Parallel Wires I The direction is given by the right-hand rule.
Force between Parallel Wires I A parallel wire also has current coming out of the screen.

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Force between Parallel Wires I The field on the second wire from the first wire points upward.
Force between Parallel Wires I Since the magnetic field comes out of the screen, the force on the second wire is to the left.

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Forces and Torques on a Current-carrying Coil A circular loop of radius 3.00 cm with current =1.20 A is placed in a uniform magnetic field of 0.065 T.
Forces and Torques on a Current-Carrying Coil A circular loop of radius 3.00 cm with current =1.20 A is placed in a uniform magnetic field of 0.065 T. If the coil is composed of 10 loops of wire, what is the magnetic dipole moment?

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Forces and Torques on a Current-Carrying Coil If the coil is composed of 10 loops of wire, what is the magnetic dipole moment? μ = NIA = NI π R 2 = 10 × 1 . 20 × π × ( 0 . 030 ) 2 = 0 . 0255 Cm 2
Forces and Torques on a Current-Carrying Coil What is the maximum torque on the coil?

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