31. A charged rod is placed between two insulated conducting spheres as shown in

Question

31. A charged rod is placed between two insulated conducting spheres as shown in the diagram. The spheres have no net charge. Region II has the same polarity as which other region? l IV A) I only B) Ill only C) IV only D) I and IV only Two uniformly charged nonconducting spheres on insulating bases are placed on an air table. Sphere A has a charge +30 C and Sphere B has a charge +Q C. Which of the following diagrams correctly illustrates the magnitude and direction of the electrostatic force between the spheres when they are released 40 B) D)

Explanation / Answer

39. Region II has the same polarity as region III. bECAUSE BY THE PRINCIPLE OF INDUCTION region II& III will have the same polarity AND RWGION i & iv will have same.

40. option D is correct as both are positively charged so both will repel each other with equal force.

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