1.

Let two circles S_1=0 and S_2=0 intersect at point A and B . L_1=0 is the line joining A and B where S_1=x^2+y^2+2ax+2by-5=0 and S_2=x^2+y^2+2x+4y-4=0 Let AB subtend and angle theta at (0,0) and angle subtended by S_1=0 and S_2=0at P(3,4) is alpha and beta respectively. If alpha=60^@,then (a,b) lies on a circle whose radius is

Answer»

`sqrt10/3`
`(4sqrt10)/3`
`(2sqrt10)/3`
NONE of these

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