# Ch-21-2 - Old-Exam-Questions-Chapter 21(Dr Gondal Phys102...

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Old-Exam-Questions-Chapter 21 (Dr. Gondal- Phys102) T071 Q15. Four point charges, each of the same magnitude, with varying signs are arranged at the corners of a square as shown in the figure 1. Which of the arrows labeled A , B , C , and D gives the correct direction of the net force that acts on the charge at the upper right corner? (Ans: B) Q16 . Three identical point charges, Q , are placed at the corners of an equilateral triangle as shown in the figure 2. The length of each side of the triangle is d . Determine the magnitude and direction of the total electrostatic force on the charge at the top of the triangle. (Ans: 3 k Q 2 /d 2 directed upward) Q18 . Consider two conducting spheres, A and B , having the same size. Sphere A carries a charge of −2.0 μC and sphere B carries a charge of + 6.0 μC. The spheres are touched together and then separated. What is the final charge on sphere A? (Ans: + 2.0 μC.) Fig. 1, T071 Fig. 2, T071 T062 Q1. Two identical positively charged ions are separated from each other by a distance of 6.8×10 -9 m. If the electrostatic force between them is 4.5×10 -9 N, how many electrons are missing from each ion? (Ans: 30 ) Q2 . A charge q is placed at the center of the line joining two equal charges Q . All charges will be in equilibrium if q is equal to: (Ans: − Q / 4 ) T052 Q#5. Consider the charges shown in figure 1. Find the magnitude and sign of charge Q 4 so that the net electrostatic force on charge Q 5 is zero. (Ans: + 1.8 nC ) Q#10 . Which of the following charge

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Ch-21-2 - Old-Exam-Questions-Chapter 21(Dr Gondal Phys102...

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