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04_09_Magnetism

# 04_09_Magnetism - Today4/9 o Lab Current Balance o Right...

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Today4/9 o Lab “Current Balance” o Right Hand Rule for: o Magnetic Force o Magnetic field o North Pole of a Current Loop o Start reading Ch. 21 o HW: 4/9 “Magnetism” Due Friday, 4/11

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Magnetic Forces RHR A positive charge moves in a B-field that points to the right. What direction is the force on the charge for each case? Fingers with B , thumb with v , force points in the direction of your palm. v B F = qvB sin θ θ is the angle between v and B. F big, out F = 0 F = 0 F big, in F smaller, in F smallest, in
Magnetic Forces RHR A positive charge moves to the right in a B-field that points in the direction shown. What direction is the force on the charge? v B F is out of the page, still perpendicular to the velocity. F F = qvB sin θ θ Fingers with B , thumb with v , force points in the direction of your palm.

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Magnetic Forces, Wires Find the direction of the force on the wire placed in a B field. I B F F = qvB sin θ F = IlB sin θ qv becomes Il The unit for B is “tesla” ot T eg: B = 4T
Motion in B Field (for HW)

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