Two small spheres of masses math xmlns=http://www.w3.org/1998/Math/...
Two small spheres of masses math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymsubmi mathvariant=normalM/mimn1/mn/msub/math and math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymsubmi mathvariant=normalM/mimn2/mn/msub/math are suspended by weightless insulating threads of lengths math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymsubmi mathvariant=normalL/mimn1/mn/msub/math and math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymsubmi mathvariant=normalL/mimn2/mn/msub/math. The spheres carry charges math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymsubmi mathvariant=normalQ/mimn1/mn/msub/math and math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymsubmi mathvariant=normalQ/mimn2/mn/msub/math respectively. The spheres are suspended such that they are in level with one another and the threads are inclined to the vertical at angles of math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymsubmi mathvariant=normalθ/mimn1/mn/msub/math and math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymsubmi mathvariant=normalθ/mimn2/mn/msub/math as shown. Which one of the following conditions is essential? If math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymsubmi mathvariant=normalθ/mimn1/mn/msubmo=/momsubmi mathvariant=normalθ/mimn2/mn/msub/math :
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