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Gravitational Field Force on mass g = Field strength g is in N/kg (9.81 N/kg on earth) F = mg (g = F/m) Electrical Field Force on charge E = Field strength E is in N/C F = qE (E = F/q) Direction: Uh… down Direction: F on + Charge Force: F = Gm1m2 r2 Field: g = F = Gm m r2 Force: G = 6.67x10-11 Nm2kg-2 k = 8.99x109 Nm2C-2 F = kq1q2 r2 Field: E=F = q kq r2 Example 1 - A +125 C charge experiences a force to the right of .0175 N. What is the Electric field, and its direction? Direction: +q Force This Way E Force This Way 140 N/C to the right -q Which way is the electric field? (wwpcd?) + + + + + - Which way is the electric field? - + + + + + Which way is the electric field? + Which way is the electric field? + - Example 2 - An electron travels through a region where there is a downward electric field of 325 N/C. What force in what direction acts on the electron, and what is its acceleration? 5.21x10-17 N up 5.72x1013 m/s/s Whiteboards: Uniform field 1|2|3|4 Ishunta Dunnit notices that a charge of -125 C experiences a force of .15 N to the right. What is the electric field and its direction? E = F/q = (.15 N)/(-125x10-6 N) = -1200 N/C right or 1200 N/C left 1200 N/C left Doan Botherme places a +12 mC charge into an upward 160 N/C electric field. What force in what direction does it experience? E = F/q, q = 12x10-3 C, E = 160 N/C up F = 1.92 = 1.9 N up 1.9 N up Alfred O. Dadark is on a planet where a mass of 0.12 kg experiences a downward force of 7.80 N. What is the gravitational field on the surface of this planet? g = F/m, m = 1.12 kg, E = 7.80 N down g = (7.80 N down)/(0.12 kg) = 65 N/kg down 65 N/kg down Telly Vishun places an unknown charge into a known upward electric field of 612 N/C, and the charge experiences a downward force of .851 N. What is the charge? E = F/q, E = 612 N/C up, F = .851 N down q = -.0013905 C = -1.39 mC -1.39 mC Sal F. Hone levitates a .00125 kg ball with an upward electric field of 590 N/C. What is the charge on the ball? (Hint gravity = electrical force) Eq = mg E = F/q, F = Eq, F = mg, m = .00125 kg, g = 9.80 N/kg, E = 590 N/C q = 2.07627E-05 = +20.8 C +20.8 C