EAMCET Engineering 2002 Solved Paper

Equation of the circle is
x2+y2=r2 . . . (i)
and the line is mx−y+c=0 . . . (ii)
The line (ii) intersect (i) in two distinct points, if the length of the ⟂r from the centre (0,0) to the line (ii) is less then r
Thus, |‌

0−0+c

√m2+1

|<r
⇒|c|<r√m2+1
⇒−r√m2+1<c<r√m2+1