Wkb Chap 11 Magnetism

Chapter 11 in C&S ,

Chapter 19 in S&F.

Chapter 29 in S&J

1. Force on a charged particle.

FB = qv x B FB = qvBsinq Note the direction of q . The direction of B is dir of North Pole.

Drill Exercises: Given direction of v & B, find dir of FB

So B = F/(qv sin q)and it has units of N/(Cm/s) = N/(A m) = Webers/m² = W_b/m² = 10⁴ G = 1 Tesla

Force on a current carrying line of charge due to a magnetic field:

F = qv_dB nAL = B ILsin q

Direction of F - Point fingers of your Right Hand in direction of I so they can curl toward B, your thumb points in the direction of F.

2. Torque on a Current Carrying Loop in Magnetic Field B:

t = BIAsin q, where q is the angle between B and normal to loop.

W = _t dq

3. Motion of a charged particle in Magnetic field.

Get them to draw the picture.

F = mv²/r = qvB, and w = v/r = qB/m Period T = 2π/w

4. Velocity selector.

Since E and B always perpendicular to each other, E•B = 0.

If F_E = F_B, then qvB = qE, which implies v = E/B.

5. Hall Effect

V_H = (Ibd)/(nqA) = (IB)/nqt , d is the width of conductor, t is the thickness of the conductor, n is the number of charge carriers per unit volume.

Assignment: (202 & 214 )C&S RQ11: 1 - 6 Hwk 11: 1 - 4, 7