The correct option (A) 4
Explanation:
For series connection, R1 + R2 = *
For parallels connection {(R1 ∙ R2)/(R1 + R2)} = p
given * = n P
∴ R1 + R2 = n ∙ [{R1 R2}/{R1 + R2}]
∴ Rxad12 + R22 + 2R1 R2 = nR1 R2
∴ (R1 – R2)2 + 4R1 R2 = nR1 R2
∴ (R1 – R2)2 – (n – 4)R1 R2 = 0
it R1 = R2 then
n – 4 = 0
n = 4
∴ minimum value = 4