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May 22B_day34.notebook May 22, 2012 Check for understanding Draw the charging curve for the capacitor in the circuit shown calculate the amount of charge after 2ms in terms of Q 1 May 22B_day34.notebook May 22, 2012 HW Planner ADD Regents review assignment due next WEDNESDAY showing all work... Video Projects DUE May 31st !!! 2 May 22B_day34.notebook May 22, 2012 Magnetism • Magnets have north and south poles and ALWAYS come in PAIRS • Like charges and electric fields, N and S poles set up magnetic field lines around them • Magnetic field lines are VECTORS • Magnetic fields are called B fields and are measured in Teslas 3 May 22B_day34.notebook Magnetic field lines May 22, 2012 Tesla = Weber/meter2 4 May 22B_day34.notebook May 22, 2012 Magnetic Force on moving charges F = qvBsinθ q = charge v = velocity of particle B = magnetic field θ = angle between motion and B field Max = Min = proton passing between poles of horseshoe magnet 5 May 22B_day34.notebook May 22, 2012 Hand Rules! Conventional current (positive charge flow) Right hand rule THUMB always points the direction of current or charge in motion Curl of fingers for B 6 May 22B_day34.notebook May 22, 2012 7 May 22B_day34.notebook May 22, 2012 8 May 22B_day34.notebook May 22, 2012 9 May 22B_day34.notebook May 22, 2012 An electron moves across the Earth's equator at a speed of 2.5 X 106m/s in a direction of 35o N of E. At this point, the Earth's magnetic field has a direction of due North and is parallel to the surface and has a magnitude of 0.10 X 104 T. What is the force acting on the electron due to its interaction with the Earth's magnetic field? 10 May 22B_day34.notebook May 22, 2012 A wire of length 0.50m carries a current of 0.10A in the positive X direction, parallel to the ground. If the wire has a weight of 1.0 X 102N, calculate the minimum magnitude of the magnetic field that exerts a magnetic force on the wire equal to the wire's weight? 11 May 22B_day34.notebook May 22, 2012 12