The equations of two circles are \( x^{2}+y^{2}+2 \lambda x+5=0 \) and \( x^{2}+y^{2}+2 \lambda ...

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The equations of two circles are \( x^{2}+y^{2}+2 \lambda x+5=0 \) and \( x^{2}+y^{2}+2 \lambda y+5=0 \). \( P \) is any point on the line \( x-y=0 \). If \( P A \) and \( P B \) are then lengths of the tangents from \( P \) to the two circles and \( P A \) \( =3 \) then \( \mathrm{PB} \) is equal to
(a) \( 1.5 \)
(b) 6
(c) 3
(d) none of these
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