# Lec-10 - deflects the solar wind – p Some Astrophysics(3...

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Previous Lecture B exerts force on moving charges No magnetic monopoles! Velocity selector Circular and spiral motion in a magnetic field – p.

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Today Force on a current I Astrophysics examples Torque on a current loop DC electric motors – p.
Remember the Drift velocity! To estimate v d , we use a different model, in which all charges move uniformly in one direction: – p.

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Force on a Current I F = q v × B F = I l × B – p.
Some Astrophysics (1) Solar wind (protons) and earth’s magnetic field: – p.

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Some Astrophysics (2) When “space weather” is clear (the typical situation), the earth’s magnetic field is deformed but

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Unformatted text preview: deflects the solar wind. – p. Some Astrophysics (3) If “space weather” is stormy, the solar wind is more intense. • solar wind penetrates atmosphere • lots of energy deposited • excited atoms emit light (lots of QM happens) – p. Aurora Borealis – p. Force on a current I If current flows in a curved path, d F = I d l × B – p. Torque on a Current Loop – p. 1 Simple dc motor The current reverses at the right time so that the torque keeps the armature spinning in the same – p. 1...
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