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V_A and V_B denote potentials of A and B, then the equivalent resistance between A and B in the adjoining circuit is(ideal diode)

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$30 Ω if V_{A} < V_{B}$

neither 1 nor 2

$15 Ω if V_{A} > V_{B}$

Both 1 and 2

answer is C.

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R = ∞ in the case of reverse bias

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