Lec16-3-LPN

Lec16-3-LPN - ture 16-1 ture Magnetic field of a solenoid L...

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cture 16- cture 16- 1 Magnetic field of a solenoid A constant magnetic field could be produced by an infinite sheet of current. In practice, however, it is easier and more convenient to use a solenoid . A solenoid is defined by a current I flowing through a wire that is wrapped n turns per unit length on a cylinder of radius R and length L . L R Stretched-out solenoid
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cture 16- cture 16- 2 Dipole Moments in Applied Fields app E ur Electric dipole app B ur p ur μ ur p ur p E ur ur B ur Magnetic Dipole External fields tend to align dipoles. B increases at center E decreases at center
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cture 16- cture 16- 3 Potential Energy of Dipole Work must be done to change the orientation of a dipole (current loop) in the presence of a magnetic field. Define a potential energy U (with zero at position of max torque) corresponding to this work. Therefore, B x θ r F r F r μ .
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cture 16- 4 Ampere’s Law in Magnetostatics The path integral of the dot product of magnetic field and unit vector along a closed loop, Amperian loop , is proportional to the net current encircled by the loop, Choosing a direction of integration. A current is positive if it flows along the RHR normal direction of the Amperian loop, as defined by the direction of integration. Biot-Savart’s Law
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Lec16-3-LPN - ture 16-1 ture Magnetic field of a solenoid L...

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