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If the line hx + ky = 1 touches x^2 + y^2 = a^2 then the locus of the point (h, k) is a circle of radius

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If the line hx + ky = 1 touches x2 + y2 = a2 then the locus of the point (h, k) is a circle of radius

(a) a

(b) 1/a

(c) √a

(d) 1/√a

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1 Answer

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Correct option is (b) 1/a

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