1.

Two indentical particles of charge q each are connected by a less spring of force constant K. They are placed over a smooth horizontal surface. They are released when the separation between them is r and spring is in it natural length. If maximum extension of the spring is r, the value of K is (neglect gravitational effect)

Answer»

`(Q)/(4r)SQRT((1)/(pi epsilon_(0)r))`
`(q)/(2R)sqrt((1)/(pi epsilon_(0)r))`
`(2Q)/(r)sqrt((1)/(pi epsilon_(0)r))`
`(q)/(r)sqrt((1)/(pi epsilon_(0)r))`

Answer :B


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