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3.

3. Rank in order, from largest to smallest, the electric field strengths E1 to E4 at points 1 to 4 in FIGURE Q23.3. Explain. 1. 3 2 + 4. FIGURE Q23.3 FIGURE Q23.41 1. II A small glass bead charged to + 6.0nC is in the plane that bisects a thin, uniformly charged, 10-cm-long glass rod and is 4.0 cm from the rod's center. The bead is repelled from the rod with a force of 840 uN. What is the total charge on the rod?2 i. | A 2.0 m X 4.0 m at carpet acquires a uniformly distributed charge of - l 0 \"C after you and your friends walk across it several times. A 2.5 ,ug dust particle is suspended in midairjusi above the center of the carpet. What is the charge on the dust particle? 37. Il What are the strength and direction of the electric field at the position indicated by the dot in FIGURE P23.37? Give your answer (a) in component form and (b) as a magnitude and angle mea- sured cw or cow (specify which) from the positive x-axis. -Q -10 nC 10 nc 5.0 cm - + 3.0 cm + L -5.0 nC 40 Q FIGURE P23.37 FIGURE P23.3847. II Charge Q is uniformly distributed along a thin, flexible rod CAL of length L. The rod is then bent into the semicircle shown in FIGURE P23.47. a. Find an expression for the electric field E at the center of the semicircle. Hint: A small piece of arc length As spans a small angle A0 = As/R, where R is the radius. b. Evaluate the field strength if L = 10 cm and Q = 30 nC. Center + + + + + L R + + + + + FIGURE P23.47 FIGURE P23.48