Welcome to Kemandi Q&A, where you can post problems of Math, Physics,
Chemistry and other subjects and receive answers from other members of the
community. It is to help high school and college students study and share knowledge.
The use of the site is free.
Need a help on using this site? click here
Two long straight wires carrying the same current I and separated by a distance r exert a force F on each other. The current is increased to 4I and the separation is reduced to r/6 .