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Questions 21-25 For questions 21-23, consider a positively homogeneously charged metal rod which is shown in the figure. 21. From point P, to point P, the electric potential difference Vp - Vp... (a) ... can't be determined. (b) ... is positive. (c) ... is zero. (d) ... is negative. (e) ... is infinite. 22. The work done by us, in moving a positive charge with y P a slow constant velocity from point Pi to point P2, ... Hint: Using simple (a) is zero. geometry do (b) is infinite. (e) ... can't be determined. (d) ... is negative. (e) is positive. 23. The work done by the electric field, when a positive charge is moved by us with a slow constant velocity from point P to point P2, ... (a) ... is infinite. (b) ... can't be determined. (c) ... is negative. (d) is zero. (e) ... is positive. ds 24. Now consider the case when the metal rod's charge density is dx 1 de a function of the angle with horizontal axis as = lo sin’e. Sino Sin- Express the total charge Q in terms of lo and the length of the rod l. (a) Xola/2 (b) Xolx/4 (c) 2013/2 (d) Alx/8 (e) lola 25. Express the electric potential Vp, at point P, in terms of X, and the electric constant k. (a) kdo (b) (V2 - 1)/2 (c) (12 - 1)kA0/1 (d) kX0(1 - 1) (e) {k{0/1 ds + + - +