two concentric rings of radii r and 2rar...

two concentric rings of radii r and `2r`are placed with centre at origin. Tow charges ` +q` each are fixed at the diametrically opposite points of the rings as shown in figure . Smallerring is now rotated by an angle ` 90^@` about Z-axis then it is again rotated by ` 90^@` about Y-axis . Find the work done by electrostatic forces in each strop . If finally larger ring is rotated by `90^@` about X-axis , find the total work required to perform all three steps .
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