You are given two vectors A S = -3.00nd + 6.00ne and B S = 7.00nd + 2.00ne. Let counterclockwise angles be positive. (a) What angle does A S make with the +x@axis? (b) What angle does B S make with the +x@axis? (c) Vector C S is the sum of A S and B S , so C S = A S + B S . What angle does C S make with the +x@axis?

Week 5 Physics 2 for Engineering Chapter 24: Capacitance and Dielectrics Capacitors store charge C = Q/V Unit is Farads, 1 Farad = 1 C/V Review: Q = σ A V = Ed Parallel Plate Capacitor C = A Ɛ / 0 C = Q/V = σ A/ Ed = A Ɛ / d 0 Capacitors in series Charge on each capacitor is the same Voltage on each capacitor is different Applied voltage is equal to the sum of voltages on the two capacitors (V = V +V ) 1 2 1/C eq1/C +11C 2 Capacitors in parallel Voltage (potential) on each capacitor is the same Charge on each capacitor is different (Q = Q +Q ) 1 2 C eq +C1 2 Energy stored in capacitor U= (1/2) Q