VA and VB denote potentials of A and B, then the equivalent resistance between A and B in the adjoining circuit is
A
15Ω, if VA>VB
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B
30Ω, if VA<VB
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C
both A and B
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D
neither A nor B
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Solution
The correct option is C both A and B If VA>VB diode will be forward bias, therefore resistors will be in series. If VA<VB diode will be reverse bias therefore resistor with diode will be removed.